I would argue that point! I've been using inLab for 8 years now, and have fantastic results. My opionion is, that the bad reviews are based on a lack of trainging and true understanding of the system. As an in-house tech for several Cerec doctors (that want the convience of "same day" crowns, but don't want the hassle of doing the lab steps themselves) I get to see the results (esthetcis, fit, x-rays) everyday. Beleive me.. this works!
Now... is every crown perfect? NO. But is every PFM or pressable done by hand perfect? Of course not!
Is there a better system out there? Possibly, but once you have inLab dialed in... I think it's untouchable, due to all the material choices, and types of restorations (custom abutments, cad-on, wax milling, model milling, etc...)!
And now it is an open architecture system. So, the options are almost limitless!
I'm sure that I just made myself very unpopular on this forum, but Sirona is a good product when the lab and the doctors both understand how to use it properly. I'm sure this is similar with any intraoral cad/cam system.