From what I heard, only season 1 uses Amiga technolog for its special affects. I'm curious myself as to how good these effects are. I never watched a single episode.
I thought they were actually quite good, and I believe all the effects are done in Lightwave, as time progressed obviously they utilised Newtek's solution of slaving PCs into a render farm I believe, but don't quote me on that. Anyway Lightwave only exists because Netwek exists and that all started with the A1000 and Digiview so it's still Amiga

Also thinking about this I forgot to mention it's worth watching Crusade also, I quite liked that and was sad to see it killed off after just one season.