I have the A7 and from what I see the difference is that the A7 squonks and fills the catch cup which is then wicked upwards to your wick/coil. Unless you are dripping through the top which defeats the purpose of a bottom feeder.
The Reomizer 2 has the Wick and mesh coil on the floor of the ceramic base and when you squonk the liquid will go directly along the bottom of the Ceramic Cup and on to your wicking/Coil. This takes advantage of the Bottom Feeders strength which is to saturate the wick directly. You aren't fighting gravity. I should be able to saturate my wick almost instantaneously.
Guess I'll find out in a few days!
With the blind squonk, juice never touches the catch cup. I'll have me a RM2 eventually, but I'm keeping my A7's. I'm a creature of habit, and not having the blind squonk disrupts my flow. I'm looking forward to finally trying mesh in the RM2 though!