OK, the good and the not so good (which I think is me not the setup).
First... I love these things!
Jonathan stated 100 feet line of sight... I bet it is a little more, and and honestly, it is only ONE test but it was a bit of a toughie. Transmitter in my back pocket (which was NOT recommended) and the receiver in the basement on the floor under the mixer, so that no matter where I went, it had that electronics to pass through as some form of interference, I managed to not only play on the main floor, but also on the 2nd floor with 100% reliability for about 20 minutes. It was strange hearing yourself from so far away, and the delay of the sound was much more than 25ms, it was like a half second... lol This is obviously NOT because of the integrated latency of the units, but the distance that the sound needed to go (up the stairs, winding around the house and up several curves to get to my bedroom. The signal had to go a nice 40 feet in a straight line and pass through 2 floors and several walls, through my body and it was still working.
So, the not so good... can I hear the latency? Well, if I turn on the drums on the left hand and hit only the snare drum over and over, it is **maybe barely** discernible, and you have to be concentrating hard at it, and then... honest to gosh... I am sincerely not sure... maybe Im hearing something or maybe not???
When playing... nope, impossible to hear any latency effects. By hearing, in this test I also mean feeling as if feeling the difference between when your fingers hit and when your ears hear the sound.
What I also tested was being in the same room as the Bose speakers, turning on the accordion speakers and balancing the volume with the Bose speakers so that they are both about the same and turning my body several directions to see if I could hear something. Man, even with sharp percussion, I have to say this... if anyone can hear that darned latency, they have WAY better ears than me... which isnt saying all that much, but I was just not hearing it!
The not so good... what I am having trouble with is getting my super cheap lavalier to work with it. I can plug the receiver in to my camcorder, plug a dynamic mic (not a condenser mic) in to the setup and it works perfectly, but when I plug in the lavalier mic in... nothing, no sound. This may be due to some lack of signal strength from the lavalier, but this same lavalier with a different plug works awesome as the mic connected to my smartphone, but that doesnt prove anything.
Im no electrical engineer, so I dont know. Id love to get the lav to work with this setup. I might email Jonathan and ask what I am doing wrong, or if someone here knows, shout it out.
One thing I will say... at this level, it is important to use good cables (if possible balanced ones all around) and wiring to minimize interference and what not and the cable that I used to connect the receiver to the mixer was total rubbish and I did hear some minor hiss, again, I think that is me, not the X-100.
So that is my first official impression, and I am happy with them so far.