The Best Soundhole Pickup Under $100
This is hands down the best soundhole pickup under $100. Sure, there are better ones for maybe $160 (the LR Baggs M1 for example), but to my knowledge there isn't another pickup better than this that isn't a permanent install or involves modifying the guitar. This is the best temporary soundhole pickup on the market right now. Period.
When I was looking for a replacement for my Dean Markley Pro Mag (which hummed way too much despite being humbucking) what sold me on the SA1 was the volume control and the female jack. When I got it, I wasn't too sure how good it was since I didn't have an acoustic amp or an amp that did anything spectacular with acoustic guitar. Now I have the Vypyr VIP 2 which I got specifically because it can be used with acoustic and I know just how amazing both of these pieces of gear are.
I use this pickup to amplify my acoustic in church and the SA1 absolutely gives you acoustic tone. Not only that, it gives you good tone. It doesn't give you that typical piezo tone where you hear all string noises but it doesn't sound like an actual acoustic guitar, instead it gives you a tone that actually sounds like a guitar, not a bunch of strings. Last night at practice I finally had some time to myself to really mess with tones and flipped it onto the Trace channel on the VIP. I was floored. It sounded like my guitar. Not a lot of acoustic amplification methods, especially temporary ones, can do that. The SA1 gives great tone, and paired with a good acoustic amp like a Fishman Loudbox, I can only imagine how great it sounds. As mentioned, the two main features that make this pickup different, the volume control and female jack, are huge. The female jack means it should have a much longer life than something with a male jack, and it's a lot easier to pack up and put in a case since there isn't 20 feet of cable to wrap up. The volume control is also fantastic. You can simply and easily turn down your guitar or mute it without having to touch your amp at all.
If you have an acoustic guitar with no electronics and you need to plug in without modifying your guitar, definitely buy this pickup. It's not even $100 but it's by far the best temporary soundhole pickup there is right now. It's a little tricky to install the first time, but after the first three times it's effortless. You can't go wrong with this pickup.
While I use an amp, it should sound alright through a PA, although a tad thin in my experience. It's nothing a little EQ can't solve. It still sounds better than most piezo systems I've heard direct to PA. (Excluding Taylor's systems.)
TIP: There's a small loop in the cable near the jack. If you push the tape holding it there up a little, it will be big enough to put around your endpin and then it won't hang down while you're playing. You may also want to tape the cable behind the guitar so it stays back there.