Hi, not sure if you have bought an Airbeam as of yet but I recently purchased a 2012 Pulse 450 and have to say that I am very impressed.
Always been keen on the camping scene but never liked the idea of spending half the time setting up camp, hence my reason in the purchase. If I am honest I first thought that the concept was a bit gimmicky but after receiving it the other day and setting it up, I am in love with it. Literally about 10 pumps and each beam was up. My friend and I set it up, but to be honest there was only need for one of us. It went up with ease on a very windy day and holds it ground amazingly well. The TBS system works well too, really helps to keep the beams stable in high winds.
I have not yet tested it in rain but with the weather down here I am sure I'll get the chance to. I've read some reviews about leaking in some of last years models so have been considering some specialty tent waterproof-er for extra protection, just in case.
I do have one negative review though, the tent that I was sent from one of Vango's suppliers was actually punctured. But Vango were amazing in getting a replacement tube sent, next day too, and they are extremely easy to replace. I used a puncture repair kit, supplied with tent, to fix the tube and after that it was fine.
I can definitely justify the cost and if you want a family one I'd recommend one of the 6 person versions for extra space.
Hope this helps.