I tried a Bell Helmet w/transions shield. Worked great and was just dark enough even though I would have liked it a shade darker.
But, for me, all Bell shields do not shed water well and, FOR ME, are just not usable and borderline unsafe based on what I'm used to.
I tried the replacement shield by transitions for my Shoei, did not geat nearly as dark as the one on the Bell, it shed water better than the Bell but since it didn't get dark enough - it was useless in my opinion.
so, for me, just having a clear and dark shield isn't that bad if that combo functions better than the transitions.