Love these things...
These things have been a savior... I play in acoustic duos, power trios & full hard rock, 80's & 90's cover bands... These things are cheap & tough. If you kill 'em, you're doing it wrong(careful with bass, kik & keys).
They act as great monitors & mains. I'm here to buy my 4th one to make a full system for the smaller rooms & more professional venues that don't require the overkill.
And these are a few of my favorite things...
-The 3-band EQ & volume ON THE FACE (of it!!) keep you from having to reach around the backside & keeps the band off your back, for the most part, when you're running the mix from the stage & playing yourself.
-Also, of critical importance, the XLR links:
1. Allows you to plug directly into the monitor before sending your signal to your PA channel(great when you want multiple mixes on a PA system that only allows for one). Making any feedback the fault of the person in front of the monitor! Their problem!
2. And, if you do decide to take control of the monitor mixes from the PA, those same XLR links allow a daisy chain signal that is not effected by the different monitors controls(one person's monitor controls cannot change the next one in the chain's signal).
Only the person controlling the mixer on the board can change the sounds all at once. But, try to keep all of the individual setting on each unit the same(In other words, set them all the same & encourage your band mates to keep their hands to themselves as much as possible).
This still allows for some individual tweaking, as long as it's not ridiculous, which is really handy on the so many new mixers that lack EQ's for the monitor mixes.
A bit long winded, but hope it was clear & helps...