I have a Selle SMP TRK, the cheapest one, which I thought I'd try before committing myself to a Strike Plus.
To date it's been pretty good esp with Montane Bionic undershorts but I haven't rushed out to buy the expensive one just in case it is less comfortable than the cheap one!
I want to do some longer runs, say 50 miles + on the TRK first and then I'll go the the nearest shop (Bike+) and try out the expensive one - they've said that is ok so long as it's not raining.