Donnie,
I have the DEQ2496 running on a pair of passive 15 x 1" wedges. The DEQ is not quite as easy to use as a manuel graphic for those quick snatches during a deafening set, but My expirience is that having saved the auto eq for those boxes as a default and another couple of variations for "bright" or "smooth" tone edited by ear, I don't seem to have problems with mid set squeals and have headroom left for the small stages I do.
I also have a pair of DCX processors one of which runs FOH and one that runs another pair of wedges but this time in Bi-amp mode. Again the polarity checker and pink noise from the DCX sets up a reasonable starting place and although I had another graphic in line, I rarely used it and once it went unservicable, I found I didn't miss it so I fixed it and gave it to a DJ.
I always ensure I have plenty of setup time and ring out the monitors to my satisfaction. I do smaller venues under 350 heads and poxy stages. I do some of what you former colonials class as national acts (UK and european recording artists with a past). No drum fill type events and can't remember not being able to satisfy the artists who can work with 4 wix foldback. I mix foldback from FOH without active filters switched in, but have the processing in the amp racks.
So there are some weaknesses in the fast access, but other than ear splitting metal bands and perhaps hip hop which I don't do, I find them acceptable for my needs. I still use the old DEQ8024 as a FOH Graphic and it remains faultless, I prefer the bigger buttons on the 2U older unit too (it also had a good result in Binks GEQ test).
Strangely at street prices the DEQ is more expensive than the DCX here in the UK.
HTH