I only have experience with the magmotor S28-150. And I don't like'm at all.
Running hot even unloaded.

I'm an Iskra convert. The small 24V 800W ones from Arena Killer are decent enough, and pretty usable on 36V.
The 24V 1.2Kw versions in Bullfrog are rocksolid. Those are the motors I want for more heavies.