I have had the Fusion (shorty wood) since Friday and I've hardly put it down. It has great airflow adjustability (very similar to an Anvil), a wide range of heat variability (big flavour to big milk), nice ergos, and decent hand balance (a bit cap heavy, perhaps).
With the 510 driptip, the stem is the same length as a DV M, and half the length of a stock Dani rosewood stem. The intercooler looks to have a more aggressive twist and does a decent job at cooling vapour down along that short path. The stem has no carb, so I tend to use it MTL being that I'm chasing the clouds. I honestly didn't think I'd be a big fan of the shorty stem, but it has a really nice pull and great flavour, so it really has won me over.
The Fusion has the potential to satisfy a wide ass range of user preferences, and heating techniques translate directly from Dani, so anyone who has used a Dani will be able to pick this up and get a good milking right off the rip.
Full disclosure, my Fusion was donated by BFG for the purpose of evaluation/review, but I'd be saying these things if I'd bought it. It's an impressive evolution in the Battery-Free Ganz lineup, and I think everyone who picked one up is going to be real glad they did!