We had trouble using a 5000RPM cutoff saw with the Diablo blade, primarily around shorter cuts. I couldn't trust students to run it.
I was looking at the lower RPM Rage Evolution 2 as a replacement. Happily, we got a donation of a used Jet metal bandsaw (
http://www.maxtool.com/jet-hvbs-7mw-...0v-1ph-414459?) and use that to make rough cuts, then finish them on our vertical bandsaw.