I bought these as a spare set in case my Mooer set went flat during a gig. I have used them in rehearsal with no problems. I am primarily a bass guitarist, but have used them for 6 strings too. Having the channel display on both transmitter and receiver is really nice, and they pair really quickly, and so far reliably. The rotating plug is firm enough and the transmitter stays at the angle it is set to in the guitar jack socket. They are clearly made down to a price, but they work and don't feel as low cost as they are. I may update this review as time goes by and I use them more, but at the moment I have no complaints. I am tempted to get a second set.
Updated: battery life is still very good. We play a 3 hour set and they are still going strong at the end of that. I have had no drop out or sound quality issues with them at all. I have the receiver plugged into my multi effects unit on the floor - the range is about 25m used this way. Because they are 5ghz interference is a non issue.
A word of caution - the transmitter cannot be used with an Ibanez Bass, the reach between the body is insufficient.