Well, I would say it depends on how big a crew you have. I know for me, I am usually alone in the theater space (gym) at the
fixture and routinely have to climb down the scaffolding (or from the top of the booth) to the light board to bring up some other
fixture, a mirror to focus to, or any other thing one would need a light-board to do.
It would save me countless hours and times climbing if I could just
whip something out of my pocket to use.
However, if you have a set-up like a theater and can have someone at the light board to turn things on and off as you ask for them, I would say don't bother and spend the money.
I remember looking at that a while ago. I wish the WRFU (wireless remote focus unit--on a PDA) was for the
express boards, because then I would seriously conceder it. the RRFU (radio remote focus unit--a weird box with buttons) just looked confusing and not as easy to use.
However, I have never used either, and that this
point I would love just a normal
RFU.