I've had one of these for a few years and gigged with it many times. It's hard to criticise these when they work so well and cost so little compared with other brands.
It is easy to use. I tend to clip it onto the pocket of my jeans where it feels secure and is easy to get at. It's compact but not fiddly. Changing channels is easy if you have to. I run mine with rechargeable batteries but I always make sure they are freshly charged before a gig and have some spare single-use batteries with me just in case.
The sound is OK , even through the supplied earphones though I use mine with a cheap pair of Sennheisers instead, but I still use the t.bone ones for something else. The only problem is occasionally the sound can drop out for a second. It's alarming the first few times it happens but you can get used to it. I don't know why it happens; maybe it is when the batteries are starting to go flat or when they are being used at the limits of range. The sound is certainly clear enough and there is no buzzy interference. If the sound man can give you a good mix then everything is fine.