Opinions will vary some but, all in all most will agree that the VX is very reliable. As with other vehicles, there will be and are some problems. Fortunately with the VX, the problems are minor. Window binding ( FIX ) is a somewhat common problem. Although in the two VX's that I have owned, I've not experienced this. (Knock, knock). Others will chime in here but I think that there is no one concern that has plagued everyone.
For the next upgrade to the site, I'm creating a section of common problems with links to either TSB announcements or appropriate fixes then this question will be answered much easier.

No, the VX did not come with a "Stock" Sun/ Moon Roof. Some members have had theirs installed custom..

Good luck in your quest!