I've had my Roost on the G-wagen for a year now. No complaints really, I also had a slight chip in the gelcoat when delivered but it was handled by Grant.
The long term revue: It's holding up really well considering the places I've taken it. Moab Porcupine ridge, Mormon lake for Expo, Death valley Steel pass, and it even made it in and out of the Rubicon!
The rear latches have settled now, and they often unlatch themselves. There's really no way to adjust them. The only time I get concerned about it is in high side winds.