Let me tell you I have those in both my rigs and they are AWESOME!!!!!! Best pistons I have ever felt. Not rough at all, I thought they might be too. When you first put them in you feel they might stick just a tad here and there, but when the oils in it takes all that away. They are seriously seriously awesome. I'm running 30 fr and 25 rear and its like a pillow, very soft feel but won't bottom out (unless a huge flat landing) highly recommend trying them or making them. I honestly won't run any other pistons nor have a thought to try something different there that good....this is just my opinion but everyone else I know personally that has used them loves them as well. Including my friend curt, owner operator of the Ohio rc factory, home of the electric Midwest champs, he's been building tracks and racing for 25 years, he just recently put them in his kyosho 1/8 scale and said he loves it, told me he can throw his car down and it won't bottom out lol, he was a skeptic for a while until now