The HUB is pretty much everyone's favorite whipping boy around here. When I was looking to replace my gear, I looked at all sorts of options (including the HUB) while re-educating myself on what to look for in equipment. I arrived at my gear decision after considerable evolution in my understanding and thought processes. Here are my thoughts on the HUB. It's a bit tongue-in-cheek, so please don't take offense at it:
"Cool Factor"
The HUB certainly looks "high tech" with the integrated equipment, the air trim system, and the nicely stowed octopus and gauges. And the grey/yellow/black coloring is aesthetically pleasing, too. I'm quite certain that the chicks wearing neon pink bikinis will dig you when they see you heading down the beach in the HUB. I also know for a fact that the cute beach bunny at my local dive shop thinks the HUB is cool. Of course, her equipment knowledge was limited to "we recommend a dry snorkel regardless of the diving conditions."
Every review that I have read from sources other than this board praise the HUB as a massive leap forward in recreational diving technology; perhaps even better than the development of color coordinated diving gear.
However, most divers I know would question your judgment (read: gales of mocking laughter) if you showed up wearing a HUB . Some people would simply harpoon you. No experienced diver I know would think the HUB is cool to dive.
Some HUB Issues
1. Integrated equipment is usually a bad thing. The HUB is full of it. HUB hoses run under and around and inside of the BC jacket. Tell me how you can inspect hoses for wear, defects, cracking or signs of trouble without taking the whole thing apart? If something does go wrong with the integrated equipment, you'll probably have a hefty repair bill because of the time involved to disassemble the rig. I understand that you can swap equipment on the HUB, but you're better off buying a standard BC if you're going to be messing with equipment swapping.
2. Air Trim System. Yes, it looks pretty cool. One button to inflate, one button to deflate. I have never met a button that will not stick at some point during its life, and if your inflator/deflator sticks, you're a Polaris Missile or a boat anchor. Additionally, when you're "task loaded" its easy to make mistakes when performing unusual or more complex actions. Furthermore, if you get in trouble, and your buddy has to bring you to the surface, will he know how to flawlessly operate your HUB's Air Trim System? Even worse, what if a stranger has to rescue you? Will that person know how to operate a non-standard system? Finally, the Air Trim System relies upon the module to activate a dump valve to deflate the HUB. It isn't a mechanical depress-the-plunger to deflate mechanism found on regular BC's, and it is an additional potential failure point.
3. Pocket Storage. Coiling up an octopus hose and stuffing it in a pocket has got to be one of the worst ideas I've seen. Putting the BC oral inflator inside another pocket is also screwy. We're talking about the stuff you need IMMEDIATELY if things go wrong. I, for one, have no desire to go fumbling around in a pocket that I can't see while wearing thick gloves for the things that may make the difference between life or death.
4. Streamlining. Yes, the HUB is more streamlined than some rigs. But the benefit of HUB streamlining comes at the cost of safety, IMHO.
I'm certain that the HUB works great in the pool and on prosaic dives in the Caribbean. It's great if you want to buy a "packaged" rig from Mares without thinking through the problems with the design. For the money, though, you can buy a better system and get the training to use it.
After all of my research (and I'm talking about months of research and reading and shopping), I settled on a Halcyon BP/Wing, Scubapro MK25/S600, plain old SPG, a Vyper computer I use in gauge mode, and a cheapo watch. Your equipment is your own choice, though.