I think it still ships with the original first generation sleeve - I would look at upgrading to the second generation sleeve (TrueGrip) and maybe get some additional ones (Lotus etc) for variety. I also bought the True Grip PRO band to replace the included one. It's a little more secure and grippy.
I found holding the thing up while using it was tiresome very quickly, so I made a hands-free setup for myself. There are plenty of DIY solutions around here if you search.
But honestly, just the basic unit was transformative for me. Incredible experience.