The dive op is very good, my second favorite on the island (after West End Divers)....but only because of some of the awesome instructors/guides at WED. SDM was great. Their rooms are certainly not luxurious, but they're great for a dive trip and staying at a smaller hotel. Their location is great because they're at the far end of West End, and you get VERY easy access to the beaches near/on West Bay. West End doesn't really have any beaches (Half Moon is pretty, but it's RIGHT in the middle of everything....I know I didn't enjoy it) but it has the night life, the restaurants, the stores, etc. West End is where I want to be if I'm not on the beach or in the water. Another option, right in the middle of West End and right next to West End Divers is Splash Inn. They're partnered with a dive op that I didn't like as much as WED or SDM, but they were fine (really all dive ops in West End are fine). However, there's no need and WED has prices comparable to all other dive ops in the area.
Long story short: You'll be fine at Sueno Del Mar if you're looking for a more basic place to go....just don't expect luxury. If that's the kind of place you're looking for, look at Splash Inn.