I have the opportunity to buy an Eddie Bauer air bender set up for about hundred squids. I haven't seen them before but it's a bag with an integrated mattress.
E.g. https://www.backpacker.com/gear/eddie-b ... -airbender
I can see the downsides and wouldn't buy one for a main set up but it would allow me to do a few alpine or winter Bivis when I'm in Switzerland for a lot less than buying a whole new set up. Which I'd like to do, but the reality is were talking about once or twice a year (and usually walking or skiing, not biking

Would you? Or were they found out to be totally useless. Google is light on details...