I personally just got the chance to look over the new Double Bull Import 5 as well as the new BS 5 models. I must say I was very impressed with the quality of the Import 5. It has every feature of the T5 ProStaff including the Predator camo, full size viewing window with net and a roof zipper all at about $100 less than the ProStaff. The inside walls are double black backked so the blind is really darkened on the inside which will make hiding any movement made while postioning for the shot very easy.
As far as the Ameristep blinds, in my opinion it's like comparing a Yugo with a Cadillac. If you want something high quality that will last for years it should be worth spending a little extra and try sitting in an Ameristep in 30 - 40 mile an hout wind gusts. The walls will more than likely be flapping if the blind is still standing at all. The Double Bull on the other hand will still be standing tall with no material flapping. More info on the new import models and all the Double Bull blinds can be seen a www.huntingblind.com. A great new family run web site specializing in Double Bull blinds and the customer service is fantastic.