George, we have had our 550 since last June, so I guess we could still be considered to be in the 'honeymoon' phase of TD ownership - we're still adjusting where things should be stored, etc., for our style and convenience.
But in terms of 'would we buy a TD again?', absolutely. As former tent, then pop-up, and briefly back to tent campers, the ease of just dropping the TD on the back of the car and going is a huge plus. Everything we need is already stored and ready to go. It tows like it's not even there, a big plus vs our pop-up. And once in a campground, setup is a snap. If it's raining when you pull in, you can just leave it hooked up to the car and jump in, something you couldn't do with either a pop-up or a tent. Once set up a pop-up gives more room, but the ease of towing and setup of the TD outweighs the space advantage for us, as we don't spend a whole lot of time inside either camper. Being off the ground vs tent camping, especially when it's raining, is an obvious plus. My wife wasn't really thrilled about going back to tent camping anyway.
Storage is another plus for the TD. While it does take up a BIT more room than our tent, it has a much smaller footprint than our pop-up. We can easily store the TD in our garage, something we couldn't do with the pop-up.
As for the CampInn brand specifically, the build quality is the best I have seen. Cary, Craig, Marty and the entire crew in Necedah are obviously committed to putting out the very best product on the market. And they seem to be constantly innovating: when we took our TD up there to have a few options added, they put the new, improved design door seals in and other updated features at n/c. CampInn's are pricey, but I think you get what you pay for with their trailers.
Good luck whatever you decide.
Ken