I like the new base layout, and the new trash piles are a welcome change to just having random bits everywhere that could potentially get stuck in a wall and make noise for eternity (not to mention how I was always finding extra trash bits I somehow missed), although I'd appreciate if they could be somehow set so that if a random object falls on top of one, targeting the random object takes priority over targeting the trash pile (So I don't have to pick up the entire pile just to get one object that fell onto it). Also I do wish there were more crafting uses for some of the scrap types.
I hated the new control system at first, but it's grown on me, and I can't ever see myself going back to the "every interaction requires a numerical menu) system. I recently loaded up my old 0.8.2 game to toss some stuff into the mailbox and I just found the old controls kind of awkward. Although I still haven't fully figured out how throwing stuff from your hand works yet. I keep doing it on accident but can't figure out how to do it on purpose.
The new coordinates and hashtag systems have their pros and cons. The new coordinate system definitely feels more interactive, like I'm actually triangulating signals from space rather than just clicking on circles, but it does start out really slow and clunky at the start of the game. The floppy disks I like because it's impossible to screw up typing out the hashcode now, but at the same time I keep forgetting the damn things- both at the base when I leave to get the codes and at the satellites after I actually get the codes; also it feels a tiny bit less interactive than the previous version, since you're just plugging a thing in and waiting until it finishes now. Also the CR towers- I'm hoping that's a bug with them right now. I remember them burning out that fast back in the original 0.9.0 release, then a version or two later the decay rate was slowed down significantly to a much more reasonable level, and now it's back to the old rate again.
New ATV I'm still not fully a fan of. It's way more clunky than the old model, and even with the overcharged engine it still has trouble getting up slopes the old ATV got up easily. Also logs and rocks are way more of a threat to the new ATV- so many of them that the old one just ramped off of that the new one crashes into and comes to a complete stop (although at least the bumper upgrade was a huge help in maintaining its durability in that regard).
I do like the new physical upgrade system (although granted, it was a little unintuitive to figure out how to get them installed at first), and the new crafting interface and drone are godsends.
All in all 0.9.0 I definitely consider an improvement, but I'm not quite sure it's ready to be called "stable" yet. There are still a TON of bugs in this version. Was planning on recommending this game to a friend, but I'm probably going to recommend he start back on 0.8.2 until some of the more egregious ones are fixed.