Buckle can still come loose occasionally at depth. This allows you to put the weight in the BC and eliminate the weight belt altogether. Excellent unit with strong lift. Lots of D-rings for the tekkies. Down side is moving it around on the beach when donning and doffing with the weight in it.
Ease of use is there and good enough lift for any scuba diver.
Has been around for years, with proven stability. Easy to don and doff with lots of pockets and D-rings. Mares Quattro are my personal favorite. They are long and supple, which translates into going farther faster without cramps or sore muscles. Mask, fins and snorkel, as well as most accessories, are simply personal choice and what fits you best.