If you do a search here on Findmall for the Pioneer Ex you should find plenty of info. Dave J. is rather fond of it as his first new detector design after joining the BH team as engineer. But I agree it's hard to find some good comparative info online when you just do a search for Camo DX.
I have one here and have found it to be a fast-responding detector that was easy to operate and accurate in ID. There's enough info in its response to a target to make a good guess whether to dig or not. It's light and well-balanced in use. It's ready to go hunting with one touch of the power button. All I did to set it up was max out the sensitivity. Object ID was very stable for the most part, especially on coins. The stock 7" coil has a nice, tight pattern that is easy to find the center for pinpointing. Depth with this smaller coil is decent and actually compared well with my older Time Ranger and its 8" coil in the iron-enriched soil we have here.
In operation of the Pioneer Ex units and their "cousins" like the Camo DX and Quicksilver, nothing could be simpler. Most coins kept a good ID and high audio tone right out to maximum depth. Increasing sensitivity did add at least an inch to the maximum depth a quarter would detect and I noticed no falsing. By setting it to minimum depth along with raising the coil over a target while sweeping it, the signal was narrowed to assist with pinpointing and determining object size. The Pioneer Ex seems to have hit a happy balance between detection depth and good target ID with a simple user interface to boot.
Hope this helps and thanks to Bucksport for posting the other BH units that share the same brains.
-Ed