Speed isn't a real factor for me. A couple seconds here and there mean nothing. The only real plus I can see is the silence. My MacBook Air makes no noise unless a fan kicks on. How quiet are people with the fusion drive on the iMac finding it to be?
Completely for me and I have about 600 gigs left of my fusion drive. The fans kicked in a little when I realised I had smc fan control installed from transferring of data, but since deleting that, its been completely silent, at the moment I'm doing a lot of imports of different media and using the computer yet still quiet