Love mine, even if it is partly broken. I love to open with tilt on very sunny days and slide fully open at night.
I have to be careful, though; the track on one side is apparently cracked and so using entails some risk although so far there have been no problems. It's also noisier than it used to be as a result. The solution for that was to install some door trim around the back rim of the opening in the roof. That cut the noise way down.
As for it being a deal breaker, I'd have to say no. I appreciate them but would not break the bank for one.