Solid and quiet! It was designed and tested to withstand near gale force winds. (#7 on the Beaufort Wind Scale if you wanna nerdy answer!) The Rev Tent is sloped and has the fly attached at the base of the tent.
Other Roof Top Tents have problems with the outer fly catching wind, as most are just "top hat" style. Owners of those tents usually remove the fly sheet in strong winds. But doing so just removes protection if rain starts... Other ground tents have flared fly sheets that often catch wind. Because the Rev Tent fly is secured to the tent itself, it performs like a champ in strong winds.