Now that I have been running the Fein Slugger for a few months I have to say I like it a lot. I can see why so many shops use the Evolution version for a lot of their metal cutting.
I have only used the bandsaws for stainless, and one piece of aluminum since getting the Slugger setup. I do have to stand there the whole time its cutting, unlike the horizontal bandsaws where I can turn it on and walk away. However it cuts aluminum bar for rough mold blanks easily ten times faster than either band saw. Probably more like 20 times faster. While I do have to stand there and work the saw its so much faster its actually more efficient.
The one piece of aluminum I've cut since with the band saw was a piece of ten inch wide bar stock that just wouldn't fit in the Fein. 7 or 8 inches is the max width on the Slugger, and I have to move the fence to get more than 6.
Slugger is also decent on general hot rolled steel tube and bar, but I wouldn't count on much life with alloy or stainless. I'm still using the same blade it came with.