TheresNoSolution.com

So a friend just asked me if there are any good and cheap wireless systems for guitars and basses out there that are quite useful live. Since I haven't got any experience with this I hoped you could tell me if there are some respectable devices out there under ~150 € and how it works with the different sound.

On a german internet shop I found a quite cheap one, would such a system make sense?
http://www.thomann.de/gb/the_tbone_tws16pt863mhz.htm

they will ruin the sound
I don't like the ones that cost 500 and more

Cheap and wireless are two things that do not mix. Mine cost me £750.