I've got a 650X with the sports screen on its highest setting. (I'm 6'1")
Fine in good weather: not much turbulence around my head and the bike doesn't weave at speed.
However, it is noisy; I can't ride without ear protection, and in bad weather the rain is sent straight into my visor making it difficult to progress without wiping the visor every few seconds. This means I can't ride with the visor cracked open and so it mists up inside in heavy rain (if I do open it I get rain on my glasses, so still can't see.)
In heavy weather it is a case of wipe, open, close, wipe, open, close... just to be able to see where I'm going.
A question for any MRA owners: does it help with rain and wind noise? (with or without a Madstad bracket)