for diving doubles, the Black Diamond makes a nice choice; once the whole gear is mounted, is easy to see why; its blade is big, and I mean big; it has a bungee-type of cord that pulls the wing a bit tight when is not completely inflated; great materials and design, and my opinion, is that the Black Diamond is an entry-level technical BCD; but if you plan to go on technical dives (what is your need for dual tanks?), and if your budget allows, look for gear that you can have selections to choose from and allow you to adjust your diving gear for the type of dive planned to do; like a Poseidon MK3 harness (just an example, since I owe one), then you can choose the size of the wing to attach to it, either average or large; and then you attach only what you need to carry on that particular dive; but the Black Diamond is amazing!