I don't use the brand, but I do have a bimini on my raft. My wife loves it, I actually used it as a sail on Yampa last week. If you have a family, I think it's a must with smaller kids. I found it cheaper online than Sombrero, though I heard good feedback about the company and the product.
Mine is a green Maravia boat, but Scott put a Kelty tarp on his and slept through a huge storm that rolled through that night.
Which ever you end up going with, make sure to get the 8' bimini and not shorter. I tried 6' and it was way too short to cover passengers and the driver.