I'm using Om quite heavily and it was my first look at react, clojurescript and single page web apps (prior Clojure experience though). Its been a reasonably pleasant experience and I can see myself continuing to use them quite a lot. Learned a lot about React in the he process too.

I personally would stick with the wrappers as it makes for a more streamlined experience. I like Om though the others look a little simpler, so may be more suitable if you're looking to stay close to React.

I am using Sablono https://github.com/r0man/sablono a lot. It is a very thin wrapper around the basic react components. IMHO I would advise getting to know React before jumping into frameworks. It's a pretty simple model and incredibly powerful on its own. That being said I think Om is a wonderful framework. But its good to understand React outside of Om.