I think I only lost about 2 inches of head room with the sunroof. To put this in perspective, my friend BigMike put the same sunroof in his VX and he's 6'2" - he told me it didn't affect his head room at all. Seems that when you're taller, you sit back further to accomidate reach and leg lenth, so the loss didn't make any difference to him.

The Hollandia does have a retracting deflector, but this does not help out with issues of back pressure when the windows are closed. You get this whap-whap ear-popping pressure at speed when the sunroof is open and the windows are closed. The external, smoke-clear plastic add-on deflector solves this problem. It does reduce the amount of actuall sky you see when you look up, but the open air feel is the same. If you can't get this thrown into the deal with the sunroof, it's cheaper to purchase on eBay (about $30 - most shops want double that).

I would think that you would experience the same pressure issue with the external sunroof (though I could be wrong), which would still be fixed with the use of an external deflector.

-- Best, John