I use them for worship in my church, and they sound simply incredible BUT there are several WiFi and radio signals in the room that occasionally interfere with the microphone frequencies, I have not yet managed to solve the problem... but it is not a problem with the microphones but with the space in which they are located where there is a lot of signal in between.

Amazing microphone

I was looking forward to integrating this wireless system with my existing setup. Decided to only use this system, and have my current Shure system off, to really put these mics to the test. Unfortunately, I will be returning this system. The mics cut off at random times. Contacted support, which was very helpful, and changed channels but no difference was made.

Excellent sound. Will transmit quite a distance. Easy set up. Would recommend to anyone. Cleans up performance with no cords to trip over

Firstly, I don't write many reviews on products that I've used first hand and I like to see how things work after at least one year of use.
We purchased this system for mobile dj use, and at first I was very pleased with their performance. After several uses I started noticing audio drop outs. I've tried changing channels with no improvement. I maybe looking for a different system soon.

The Samson Stage 412 Four-channel Handheld VHF Wireless System Worked well for an outdoor Tent Revival with 3 Bands. It took some extra time beforehand to find 4 channels that didn't interfere with other wireless equipment, but we got there. Also had to reduce the factory-peset gain in each handheld mic to make more headroom for the transmitters to handle the vocalists who really get loud. I'm glad I added them to my collection of mics.

Don't get attracted by the price. You're only buying frustration. Luckily for me I purchased this unit used from Sam Ash (Open Box). Range is very limited. Frequent Cut-outs. Just overall poor quality. What you expect to find at your local Flea Market.

Save up and get a better quality system.

I ordered these cause i needed some new mics but was very disappointed in these mics very poor sound and if you don't hold them straight in front of your mouth they will not pick up anything. Not worth the money.

First, the Samson Stage 412 Four-channel Handheld VHF Wireless System is a sturdy, well-made unit. The mics sound good and seem to be reliable. You can't beat the quality for the money! For a band just starting out, with multiple vocalists, it's a great deal. The mics are frequency agile, offering a range of available frequencies for each of the four mic/receiver combinations, so avoiding interference is assured. The method of pairing an individual mic with its receiver is a bit clunky, but manageable. Four individual displays provide channel info, and the mics have color-coded indicators already in place to help keep track of who's on which mic. The system provides THREE balanced XLR mic level outputs (a full quad mix, pair 1&2 and pair 3&4), PLUS individual 1/4-inch unbalanced mic level output jacks, one for each mic.
Each mic transmitter has an onboard gain control to turn down the SPL sensitivity, and they all run well on AA batteries. The receiver unit comes with an outboard power adapter, and Sweetwater offers a spare/backup adapter as well.
For me, coming NOT from the music end but from the Pro Audio end, the system has a few drawbacks. The XLR outputs are quiet enough, but do not fit all situations, especially where separate mic control is crucial.
The unbalanced jacks are useful, but they are somewhat noisy by comparison. Not a problem for rock or metal, but spoken word (e.g., conferences or meetings) requires a lower noise floor. Additionally, I would have preferred (and expected) the 1/4-inch jacks to be LINE or PREAMP level, not MIC level. That would have helped immensely when my mixer ran out of Mic inputs with plenty of line inputs still available. In my experience, pro audio favors low-impedance mics, and so rarely uses unbalanced 1/4-inch connectors. Samson would do well to equip each of those jacks with a mic/line switch to choose the output level etc., to better match their usage.
The jacks on the rear panel of the receiver unit are not marked with such details as level and impedance type as I recall, so you'd better be familiar with the specs before you throw this system into use.
BEWARE: The Samson Stage 412 Four-channel Handheld VHF Wireless System does NOT come with mic holders to fit the four mics!
Given this unfortunate oversight, it would be nice if Sweetwater were able to suggest holders (and patch cables) to match this system when you check it out on their website. Make sure you research appropriate holders and cables if you go for the system. I had to forego using this system when it arrived, until I could order those ancillary -- and very necessary -- items.
Finally, it would be nice if Sweetwater could suggest a carry-case to fit the system AND its four mics. You probably don't want to carry the original box around to your gigs, and you REALLY don't want to just throw it into a road case with other stuff, so a case that will actually fit and protect it is almost essential.
Of course, these items will add a bit to the overall cost.

If you pull it all together, the Samson Stage 412 Four-channel Handheld VHF Wireless System will serve you well in the right situation. It's a quality system at a great price. Make sure it fits your particular needs and you won't be disappointed, I'm sure.

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I've had to send this unit back three times. Finally gave up and bit the bullet and purchased a different system. A constant headache to do a show and the constantly loses RF signal and cuts out. Go with a Vocopro or Seismic Audio if you're looking for a cheaper system that actually works. Love Sweetwater but they failed me on this one.