The T.bone IEM 100

I bought it in April 2011 to use it for occasional gigs as a guitarist/vocalist, that's why I didn't get a more expensive in-ear system.

The first thing I did was to get rid of the headphones included to use my Shure SE215.
I am very disappointed by this system: First of all, it makes a lot of noise, to the point of driving me crazy during very soft songs. Then, lows are practically non-existent. It would be nice to be able to hear the kick or the bassist next to you!
Finally, and to top it all, the receiver is a real crap. I had the opportunity to use it with a good setup (Yamaha M7CL as FOH, mics that cost an arm and a leg and a great sound engineer) and there was nothing to do, it has hardly audible. Thank God I had a couple of wedges when I plucked my headphones.
When it comes to sturdiness, two months after buying them I had to send them to after-sale service because, for an unknown reason, they didn't work anymore. The receiver was declared dead a couple of months afterward, after I dropped it (it wasn't correctly fastened to my jeans).
So, in the end, I only use it for small gigs and with only one ear. It's perfect for that: Cheap, I send it the vocals and a bit of my guitar and it's great, with the advantage of taking up no space, unlike a monitor speaker. As for the rest: Stay away from it!
Nevertheless, for a system that costs less than $250 and works, I give it a 5.
PS: Do note that for less than twice the money, the same brand has just launched the IEM 200... We'll have to see what that's about, although for the price, I think the defects ought to be corrected and it must be similar to a Shure PSM200.