I've tried it and installed it as my sole OS - no issues so far (after several hours testing) apart from a cosmetic one. Excellent work!
The "cosmetic issue" is that some GTK apps "flash black" when updating (yuyo-dark theme). The colour change doesn't persist, but it is noticeable:
I think I've seen it reported elsewhere, but this notes that it's still there in 15.04b2.