Yes it did make the ride a bit more stiff, lucky for me that's what I prefer. I've had many cars with custom wheels on them so I'm use to watching the road pretty close.
I can't really say anything about cornering I haven't really driven it too much since putting these on. I've probably only got 25 miles on the set up.
Oh and the wheels up front are 20's for now, but I'm hoping for 22's.
This has been quite a bit of a learning process, and when you go look for wheels for an SSR you'll understand what I mean. It's a long process, but well worth it.
I'm very pleased with the outcome.