Personally I found Shapeshifter and BasiliskII to be better emulators than Fusion.
Depends on your setup, I guess. Personally, Fusion handled partitions alot better, and on my old A4000 with an ECS Spectrum card Fusion was very usable whilst ShapeShifter wouldn't cope very well with my gfx board. Nowadays with my Mediator equipped 060 A1200T Shapeshifter performs well even in 32-bit screens, where as Fusion's hacky MMU calls won't even function on my machine.
I wholly agree on their business ethics, however. Whining about poor sales when those that were willing to pre-order your product for a hefty pricetag were left in the cold without either a working product or the money they invested is rather pathetic.
It's no wonder that only 1,000 people wanted to put any hard-earned cash towards AOS4/A1 considering all the money scams we've been dealt thus far: iFusion, BoXeR, MiamiDx, etc.
BTW, does anyone know how to use a partion with Basilisk? I cannot figure out how to calculate the strange "Block" system it uses...