It's nice that these parts are now available again, however, they have a few bugs that are not sick, even the previous generation. 1st Engines do not adhere rigidly fuels which definitely makes it difficult to enter the orbit. 2nd Engines attract the right (see 1st). 3rd By instability mechJeb rockets is unable to control the rocket during the climb. 4th Decouplers are too soft (for me). 5th Lower decoupler VA has a bad icon. P.S. Sorry for english I use google translator.