I have owned outboard digital eq and I don't think it really makes a lot of sense in this age of plugins. My feeling is that if I want to use digital eq I might as well just go with a good plugin. Live sound is a bit different, if you need an eq that's recallable then outboard digital eq makes sense.
The eq's I owned were the Yamaha DEQ7 and the Roland E-660. Of the two I far preferred the Roland unit. Actually pretty nice sounding and easy to work with due to its "analog" style user interface.
I have a few outboard eq's now, but they are all analog.
One of the main issues with using outboard digital eq is that if you are using their analog I/O it adds another DA/AD conversion, something I prefer to avoid when possible.