I don't really see a huge reason for it in Muay Thai, doesn't really look like it would be that great for kicks.
If you want to throw body shots and uppercuts you'd be better off getting something like the Fairtex HB13, at least then you can throw kicks with some power and get some decent combinations in. Probably get some nice knees in too.
Kinda depends what you have already and how specific you want your training on the new bag to be.