I need to get a machine for sinks and tubs for my new business. I am trying to decide between the Spartan model 81 with 5/16"x50 open hook and the Speedway st 210 200 series also with 5/16"x50 open hook. The Speedway is about half the price, but i would rather pay for the quality. Ive never heard/used anything from Speedway. Has anyone used this product or heard pros and cons about either of them?