I don't mind EPAS but I really don't like the eBay unit for on-the-fly variable control over the assistance. It's okay in the hands of someone sensible that puts the time in to find a safe medium but put it in the hands of a muppet who doesn't know any better and thinks its funny to have max assist at high speed is going to cause an accident.
If I fitted EPAS I would have to give it a correct speed signal via the ABS/CAN multiplex and that would be a pain. The PSA HEP setup just needs a relay switching a fused battery feed and some hydraulic lines. A careful buyer can have that setup installed for say £120 (I paid £38 for my used and working HEP with the hose unions) and most importantly you don't have to faff about with replacing the rack, subframe, column and all those other really nasty jobs on the X65.
Each to their own though as both setups aid the engine pickup.