Apologies for just seeing this now buddy! The thread has been dormant for awhile, so just getting caught up.
I did BJJ and Muay Thai for a relatively short period of time. It was only three months or so. The biggest thing you'll notice by far is that you'll be able to move a whole lot better in the gym. It does wonders to your mobility and if you have tight hips like myself, you'll find they feel much better after just a few weeks of BJJ. The toughest part for me was the stretching, mobility, and warming up in BJJ LOL.