I am also the lucky owner of an Innova 18" with the 10' frame. I have had it for about 9 years and absolutely love it.
I have had no issues with it since I purchased it. This week, I had some bobbin issues and my dealer walked me thru some things. But, I also made a call to Innova tech support on a Sunday and I received a call within 5 minutes! Their customer support along with my dealer (Ryan's sewing in Albuquerque) have made it a true joy to have this machine.
It is built so you can do any additions you want and your imagination is the only restriction (adding lights, adding cameras, adding batting holders, etc.). And, when you want an "upgrade", it is available without having to replace the whole machine. This machine is a workhorse and I am not intimidated by it's workings at all. It does not require fancy maintenance or expensive trips to a dealer for maintenance. I tried out many before purchasing the Innova and it is by far the best machine I found. Good luck with your decision!