They are one of best manufacturer in low power RF front end modules with very good performance at budget price range as compared to other similar products available out there today (such like MSP430).
I had used their pcb's many times before but have never reviewed them though so cant really comment about that! All i can say is they do what it says which means you get quality stuff even if your not well versed into this area - just buy from reputed sources such us these guys ;) No particular dislike or anything else - would recommend all my friends who want simple yet reliable solution without going over board too much!