If anybody shows interest in this I'll probably part ways. Thing is basically new... not even fully broken in. $250+ship. Again, mostly seeing if anybody is interested...
I want a BL instead It's a D1. Yes, its priced near the new price, because it is practically new. I figure you can't go wrong saving ~$30 and getting basically the same thing, quicker. I'm not forcing anyone to buy it. see below?
Don't get a BL, its about a 15% increase in motor purely from the non-vented t-yoke (less magnetic saturation gives it more BL) but its a shorter coil and its going to have more distortion from the lack of vent and less linear BL curve from the shorter coil (bl as in BL product, not the name for the driver)
Stick with the Q. I don't think you will even get much of an SPL increase if any, especially if the box stays the same, you may even experience less bass because of the higher damping factor in the BL driver, maybe a dB for the higher frequencies, but anything worthy of bass, you're not going to see any increase, only decrease!
God damnit, why did Fi name a driver "Q" and "BL", that is just unfair to people who talk about TSP's
Grrrr...
Piece of advice, learn to read about TSP's and look at driver topology and you can pretty much discern any marketing hype from real engineering.
It's a D1. Yes, its priced near the new price, because it is practically new. I figure you can't go wrong saving ~$30 and getting basically the same thing, quicker. I'm not forcing anyone to buy it. see below? 
"customer"