I just received some of these risers and I'm extremely happy with them.
6'4-5" depending on the day and the wind nearly covers my entire helmet, it catches just under my bill but it's really not a big deal. The quality is there too, the plastic feels solid as hell.
Only thing I would say is the slots cannot be fully used since the windshield bottoms out before the end of the adjustment slot, but that's not a big deal imo and I'm sure it will be resolved in the future.
Highly recommend these risers to everyone who's on the taller end/wants more room up front.
@RRockTools did a great job with the print