I don't personally run it, or even know anyone who does, but I'm sure you've heard most of the draw backs of an unsupported piston skirt at BDC. I'm sure people run them without any problems, but others have had hell with them it seems. I would think piston life is shorter with a bolt on kit versus having your cases bored for the bigger sleeve, but I understand that's a lot more work.
Some of the OG's will chime in soon. They have forgotten more than I have learned lol