I'll echo Bill. We had a sound designer
purchase them and bring them in for a show we had. Despite the fact we had a
line on free rental for
Sennheiser EW100's for the asking.
They are cheap. the microphones are very sensitive which makes any amplification a problem even in the most benign and friendly of spaces. (of which ours is not) (for this show they only facilitated what i would
call "Weak reinforcement"
A cost'/Quality thought for you. Just 2 mic elements for a
Sennheiser EW100 series would run you about 300$, and are the most basic
element Sennheiser provides. and with the four
channel GTD's you are getting 4 "elements" 4 handhelds and receivers. For LIve theater or even any kinda of vocal performance I would not recommend this
system. Even the
Shure SLX
base mic elements are 74$ish a peice.
The mic
frequency response is fine for just talking/lecturing, but you put moderate quality singer behind the GTD
system and you'll be disappointed.
Another anecdote DON"T PUT the batteries in BACKWARDS. The haven't even thrown in the 1 cent transistor or whatever to prevent your packs from frying themselves when electricity flows the wrong way. "they'll work", batteries in backwards; until they get hot and start cooking your performer and then are dead (the packs, no the performers).
I'd say to look at this
system as a tool that "could get the job done" but should be considered an expendable; just like batteries and
gaff tape. For their cost if you are buying them instead of renting, the money might be in the GTD favor if you can cope with
IMO their quality issues.