I have the store version. I can't be certain as to whether the ASAS system is actually "broken" on some installs, but what I have I do like most of the time. I mostly build rockets, so I have very little input on planes. While launching, I do see some movement toward the prograde indicator (if I have ASAS locked off of the prograde) without me telling it to do so, which makes me have to adjust it manually, if only slightly. While some might pull their hair out at this, I consider the alternative (large, complex rockets wobbling themselves apart from engine gimbal compensation) to be worse. Perhaps the strength of the reaction wheels' corrections need to be increased during burns/launch? While in orbit or in transit, I have not had many issues with ASAS. I have experimented with what it does with RCS compared to what it used to do, which is eat through a 2.5m tank of monopropellant in about 2 minutes (exaggeration, I know, but it's for effect ). Mostly I've seen very few instances where I've had to move the craft over to a maneuver node, for instance. While burning, it seems to do a fairly good job at keeping my heading where it needs to be. Any small issues were solved by turning RCS on. One thing I love about it is the ability to control the craft while the ASAS system is on. That alone makes me like this system more than the old one. I won't point fingers at anyone having a lot of issues and say they're being unreasonable or anything. I'm sure there are issues with the new system that need to be solved for many people. That's why it's release 0.21, not 2.1. For my purposes, it's been mostly positive, with a few minor caveats. I'll keep experimenting with larger and more complex craft, and post feedback.