I am pleasantly surprised how well Remote Play works on Vita. I played through I think Chapter 5 of Killzone on my Vita and noticed no lag or any other major issues.
My biggest problem though is that my hands started to cramp up due to the way they had to be positioned to not touch the back touchscreen. For those that don't know, the back touchscreen is broken up into quadrants to replace R1,R3,L1,L3. Functionally that works fine but the way you have to hold the Vita to make sure you don't accidentally hit something is a pain.
Overall, I'm glad that Remote Play works but I don't really see myself using it a whole lot unless someone really wants the TV.
How's everyone else's Remote Play experience going?