I loved my OG too, for the same reasons as the others, and knew without a doubt the Reo was the fit for me. I've never regretted my decision on either one. The Reo is so wonderfully versatile. Squeeze, DD, tank, carto, atty... whatever your preference, it can be worked out on it. It's never messy, it's so sturdy I bet my hubby couldn't break it and he breaks SS thermoses every week. I'm in love with it.
My runnerup is the Volt. I use it during hands free times like playing xbox, or when I go out. Sometimes even more. As long as it's a good carto on it and not a dud, it's pretty great. (satisfying).
I would never give up my Reo for the Volt. They just each have their place in my life.