I have a two-piece RC and like a few others have said, it's a great suit. I have to admit that I got the 2-piece because at the time, I felt that it looked less dorky than the one piece. But over the years I have appreciated the ability to take off the jacket and leave the pants on so as not to freak out people at restaurants or gas stations with the LD Comfort Shorts I usually wear under the RC! At least that's what my wife tells me!
Now that is a classy looking outfit, am I right?
I can see where the the one-piece is marginally easier to put on and take off with the single zipper from ankle to neck. But the 2-piece has to be the second fastest suit to get on and off.
Spent some time with Wayne Boyer of Motoport at WeSTOC in Nelson last summer where he went off on Aerostich, and how it's merely the best of a bad lot and nothing, but nothing compares to the mighty Kevlar Motoport gear. Nearly turned me off of the whole Motoport story, because for every testimonial for Motoport there is one for Aerostich too. They have good gear no doubt, but I still like and prefer the look and feel of the Aerostich.
I did buy a pair of Motoport kevlar summer gloves and they are excellent gloves!
All this being said, though, just like with tires, oil, bikes, Gen I vs Gen II, and a whole bunch of other stuff - to each their own, and YMMV.
Just my opinion!
Ian