Ive gotten to ski the hellbents and ep pros, but unfortunately only hardpack/crud for the ep pros.
They are very very soft... I clicked in for the first time, did a few pole pushes, and tried to do a little butter/nollie.... and promptly went over the handlebars onto my face. Thats how soft they are.
The softness also makes them a lot of fun though... you can actually hold a manual or nose manual while skiing; you can even smear in and out of switch/regular while holding a manual.
One negative about how soft they are is that they dont have enough pop to help you ollie very high... on hardpack atleast. I think they may still ollie well in pow, but I didnt get the chance to find out. I think if I spent more time on them, I could have figured out how to slow down my ollie, and still get some good height... not sure.
They have less sidecut than the hellbents, which I though was a good thing. I didnt catch edges going forwards or backwards on the ep pros.
They are really really bad trying to ski forwards on groomers. You cant carve, they are terrifying going fast, and for some reason they push you off your center of balance (hard to explain... Im not even sure what I mean by this). I think all that is to be expected though.
However, here is the strength of the ski (of course), they are INCREDIBLE switch. I ski a lot, but am not really a park skier, and ski switch very rarely. So, I usually feel pretty uncomfortable switch. However, once I spun the ep pros around and started riding switch, I felt far more comfortable than I did skiing them forwards. I rode them top to bottom non stop through any terrain and crowds, without ever feeling the need to turn back around.
They have enough sidecut that you can carve them nicely, and if you feel yourself gaining too much speed, the rocker allows you to smear them a bit to dump speed without worrying about catching an edge. I also think that because they are so fat, its very easy to keep your balance skiing switch.
So, I guess I would conclude that the ep pro is a specific quiver ski, but is very very good in its specific niche.
If you ski all-mountain, or bumps, or anything like that on them, they will suck.
If you are either skiing pow, or messing around switch and skiing park, they are great. Id also add that they could be a really fun park ski, which you wouldnt necessarily expect of a ski this fat.
Wow, that was a really long review, I hope someone actually read it all the way through and it was helpful to them.