I've had my MacBook Air 8 months now, lot's of banging around and carrying all over the place ... I just got back from a week in the Muskoka's where my Air was used at the cottage, on the deck, in the boat .... it's been banged, bumped, and used, (not abused) and it's works GREAT !!!
I have a newer 15" MBP as well, the latest model with 256ssd hard drive ... I'm typing this on my Air sitting on my couch .... my 15" MacBook Pro is sitting on my desk powered off and closed... haven't used it for quite a few days. Reason being, the MBA is so much more convenient, easy and fun to use whether on a desk or away ... it's thin, light and imo the best Mac to date to type on and use ....
So be careful reading around here, 'many' opinions are from people who've never owned an MBA or from those that own a first gen and/or a 4200 HD model, in which case I most likely would of been disappointed too.
The MBA as it is now I would bet a large sum if you give to 100 people who slam it and claim it's 'not powerful enough' or riddled with problems... I'd bet 80 of the 100 people wouldn't give it up ....
The MBA is an EXCELLENT machine ... use it for what it's for and you'll never have problems ... compare it to MBP's all day or expecting desktop performance is only fooling yourself.