Just my .02. I purchased a Milwaukee porta band and mounted it in a bench vise. I had a horrible time at first blades would only make a couple cuts then break. I stumbled across Lennox blades on sale at Lowes and after using them for the weekend I went and cleaned off the shelf.(the associate said they were clearing them out and were discontinuing them) I just put my second blade on and its been close to a year.
A BIG thank you to Johnwa for selling me his unused machine. Man he has got a pile of metal working machinery packed into his garage. Several lathes, mill, shaper, planer, and other stuff. Was fun visiting.
I'd be interested in pulley diameters on yours (to get an idea of strokes/minute). Anything larger than a 1" on the motor makes mine stupid fast. I may increase the main pulley to got a bigger one on the back end.