One of the small disadvantages to a full cap is that after about 4-5 days you will probably be able to feel stubble growing through the lace. I don't think it's a huge deal, but it is something to be aware of. After going full cap I would never go back to a partial unit. I don't even know if I would go back if I had plenty of side and back hair. It's just so much easier when you don't have to worry about color, blending, etc.