Hi Bill
I've used an RFX2000 EFTP with Charlies patches since 2005. A good unit for Shads work if you cant afford the more modern and more expensive units like Q2.
Charlie by his own admission will tell you that by his high later standards these fall short but only due to the lack of technology in the Zoom rather than duff patches. Whatever the case,they aint so bad and ALL my SFs are done with it .
The Achilles heel of the unit is the front Mic socket that you MUST use in order to get the best out of it. Ignore the Send-Recieve loop AND the inputs on the back. Mic socket has twice the impedance and gives a much better tone. HOWEVER it works loose over time and the cure is to open the box up and use a caulk to fix it firmly in place before repeated use cracks the circuit board to which it is fixed. It has an external PSU on 12v
AC, yes AC which whilst removing a source of hum from the proximity of the unit does mean its another item you have to remember to carry around with you in your Grab Bag - or it wont work! LOL! Guess how I know this?!
Charlie used NOT to program other folks RFX2000's, you bought them from him ready programmed, but he may do these days as the unit is quite elderly and he may sell the patches nowadays.
cheers
Ian