Roco's coupling is the same pattern as Hornby supply, compatible, just slightly shorter. I mix the two to get optimum coupling lengths between different coaches. Dunno about Profis, but bound to have been discussed on here before.
I'd be quite happy with the Roco/Hornby pattern, as although they look awful if projecting from the end of a rake, they're wonderfully reliable and pretty unobtrusive (in my experience) within a set. Also much easier to couple and uncouple than the false pipes that are supplied with the Bachmann Mk1, which require to be disconnected from the NEM socket - fine for two coaches, cumbersome beyond that.
I'm looking forward to these models coming out. I expect to stick with my Comet plans for maroon vehicles (I can paint a single colour livery) but will possibly use the Bachmann models for any crimson/cream coaches - if the glazing and livery colour rendition is good enough.