We have tested the DMXEtherGate with the RangeLan2 Wireless Ethernet Adapter from Proxim. To do this it's very easy, Proxim provide a screwdriver with which you can toggle a switch. There is no delay noticeable on the DMX signal.
Refresh rates are identical to a wired version.
Out nodes around the venue, really it's up to you. The RangeLan 7921 from Proxim is a very flexible and reliable product, combined with the DMXEtherGate you can instantly solve all your DMX512 distribution problems .