I own the Seaquest Pro QD i3 BCD. It works like this: lever up - inflate, down - deflate. So indeed, the advertising on their site is as wrong as it could be.
Now on the practical side:
- the lever is well designed, with a wide movement in both directions. How much you push it controls the speed of the inflate/deflate (and this really feels great).
- the lever position is very confortable for reaching even with the opposite hand if needed (at least for me it's not a problem)
- it would be very hard to entangle the lever and inflate/deflate by mistake, because of it's shape. This is exactly like saying that you could entangle the hose of the normal inflator and cause an unwanted deflate (I never heard of this happening also).
- the BCD has a oral inflator system, hidden in a shoulder pouch. It is a fragile hose, with a mouthpiece that needs to be pushed over your teeth in order to open the airway. But you really don't need it.
- If you hate the oral inflator, you may always replace it with a standard inflator. By doing this, you will have both the i3 and a standard inflating system, both connected to the same BCD - so you could use any of them (as you like). This solves all your doubts, related to safety during dives.
- the BCD has two one-way valves. (one up and one down). They dump air very quickly when you push the lever all the way down. I never had any water in the BCD at the end of the dive - so the one-way part really does wonders.
- when you use the i3, both valves dump air at the same time
- the upper dump valve has a normal backup wire that you may pull if you wish.
- the BCD has a "octo pocket" on the inside, that lets the octopus head to be visibile just above the external pouch. The system is great - the octopus stays there out of your way, hold by just a twist in the hose, and can be removed easily by pulling it out.
My feelings are that this BCD is a really great device. It's really sad that the wrong advertising made it to be hated by divers - it really doesn't deserve this.
Feel free to ask anything else about the i3 - I am a happy owner