Last year GTRV quoted me slightly more for their T-Top than Sportsmobile's standard price for a Sprinter PH top. Each has its advantages. For the GTRV it is primarily the lower profile and I like that the top fits onto a fiberglass wrap around base with lip attached to the roof, whereas the Sportsmobile seats on the existing steel roof.
Sportsmobile PH advantages include having a full length roof cut out (GTRV is smaller), more headroom in van and above the bed, using a heavy duty convertible top fabric compared to GTRV's light weight sunbrella type fabric, and, big for me when cutting into a brand new van, Sportsmobile has the only Mercedes tested and approved poptop, and the only pop-top installer certified by Mercedes through their Master Upfitter program. I went with Sportsmobile PH and am happy with it.
Here are pics of the inside of the GTRV slant top roof and the Sportsmobile PH.
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