Not much help really but we got one of those round fairly cheap ones in our bathroom which was ridiculously dark (no windows) and it has made a HUGE difference for not much outlay. I would say go for it!!!
we put one in our other house in the upstairs ensuite - made a huge difference to the ensuite and the bedroom itself. We have one here in our kitchen, brings so much light into it.
But having a glass bathroom roof? Mmmm. You're braver than I am - I don't like people looking at me when I'm fully clothed! I'd get it frosted or something like that. Make sure it can open too to release all that condensation.
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