I don't. My experiences with them as a company have been positive and I have purchased several rod blanks from them when i first started building, but none were the Xi series.
I now primarily build Sage rods for myself. It's been almost a year since I have built one! Holy crap, what rod do I "need"? I do have an 8wt and 10wt Sage Xi2 blank in my closet, but haven't had a need to build them yet.