I had one and just sold it a few weeks ago. It's great if you're not moving for a few days and you don't need the luggage space you lose with this tent....it's very large. If you are moving locations everyday, it would get real old quickly.
The main advantages are camping in the rain. You can pitch the tent in the rain without getting the inner tent wet and have a huge vestibule to sit and hang out. My tent was 100% waterproof in the heaviest rain.
The disadvantage to this tent is the size. It takes up an enormous amount of space on the bike and at the campground. You have to have plenty of room on the bike to haul this 13 lb behemoth. When you arrive at your destination, you'd better find a huge flat spot because this thing takes up a bunch of square feet. Also, it is only a three pole design which makes in non-freestanding and prone to flapping in the breeze, which it does readily.
I would've kept the tent if they would make the main tent part free standing by crossing two poles and maybe made the vestibule a little smaller. It's just too much fabric to sort out when pitching and it gets old.
Just my .02
Mike
