I have had 9.2 for at least two years. It works perfect. Never had any issues with any version. Yes I have the extra return spring and ground wire and checked all the grounds also. I only did that to be proactive in maintenance. I have a carb, it is not drive by wire. My friends have ZO and they wouldn't ski behind my boat for years. Situations changed and for a little bit he had to ski behind my boat. He was very happy with it and did not see that much of a difference. (I'm talking about a 41' skier here.) I don't ski any better or worse behind his boat or mine. Yes I've also had my puck updated couple years ago also. They do it for free, you just pay for the shipping. I have had one issue with perfect pass and only one. And it has nothing to do with speed control per se. After getting my PP display wet over the years (numerous times) it was finally time to replace it. I get the new display, I put it in. Everything seemed fine until I started using the contrast buttons. Increasing the contrast actually decreased it. Okay, I call PP. They're telling me that no, "This is the way it's supposed to work." I'm telling them that is not the way it's supposed to work you are decreasing the contrast. At any rate we went back and forth with it and I have to live with it. There was just no getting them to admit that this was wrong. You know, I hang out in Canada a lot and unless I'm missing something the word decrease and increase mean the same thing in Canada as they do in the US. (I'm not talking about the letter Z). It is what it is. Having said that I don't know why you would ask this forum first anything in regards to PP problems. I've never seen a group more easily accessible and want to help with their product then the staff at PP. They're the best. To be totally honest I would feel disloyal buying something with ZO in it. I read these guys on here with all these wacky background settings and I have to scratch my head. It's like what? I never have had these issues. I'm not discounting anything that people claim they're having problems with but I have never had any. I don't think you could go wrong spending the money on it. You know, you could spend a $100 k plus if you want ZO on a new boat. I think NOT.