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I will say that it took me probably 45 minutes to put it on the first time, but most of that was just figuring out how it installed
I do recommend getting a good cover for the top when you store it, otherwise its pretty easy to scratch it. Then you'd wish you'd bought the premium that came with the cover. I agree there's a big price difference. One thing is the premium top is really light, feels as light as the CF Tesla top. The cover that came with it is neoprene and gives a nice fit. I put the glasstop and my Roadster CF top inside the Tesla hardtop storage bag together in the summer. Its padded very well.
Curious how much Visium or Mr Fiat would sell the hard top cover for alone.
Tesla sells (or at least did sell) a cover for Tesla's own top. I have one for mine (the Sig100s included the hard top). it would be a little larger than needed for this glass top since that top does not extend over the rollbar like Tesla's top.
The price differential is $700...I'm sure the storage cover is nicely made, everything about this product is outstanding except the English translation of the installation instructions!
Today for the first time since installing my Visium top I drove in heavy rain, for half an hour. I could not find any evidence of water leaking into the cabin. My soft top did leak just a bit at the top front corner of the driver's side window.