Judy just brought over a SoLong 6 that she was making some customizations on, for me to check out. Amazingly, it's even roomier than the Solo, without sacrificing the advantages of the solo.
I could stretch toes out, hands extended over my head, flailing around. If you don't fit in one of these, you're probably already used to getting EVERYTHING you own custom made!
I'm not super tall, but it seems like it would be the go-to option for anybody that is, or anybody my size that wants even more usable real-estate than the Solo, with a minor weight penalty. SoLong + Wedge == Winner.