Dont know if the rings seal better, havnt measured on that, but I must say it took a little longer for them to -sit- than normal mahle rings, and that was wiseco flat top pistons.
I assume you refer to wiseco supersquish pistons concerning the temperature question? If so, I just bougt myself a set that I have not yet drivin with, but I have been told they accumulate temperature better, and I really hope so since I bumped my CR to 13:1
Jakob