I have a 1x42 Delta and also a large 6x48 belt sander. I find the Delta gets used most often and actually is better for grinding out blades. Make sure to get some Zirconia belts for steel though. The 1x42 has good speed at 3000 SFPM which is good for grinding with. At only 2000 SFPM the 6x48 seems to make the belts dull really quickly rather than grind. I had a 1x30 sander and I can say that I really did not like it too much because it had too low of amps and had a crappy dust collection system, so it just made a huge mess if you tried working with wood. Even with the shop-vac hooked up, the dust spewed out of every part of the machine. The 1x42 is a great little machine, very clean (excellent dust collection system) and has very good power. Even though it is only a 1/3 hp motor, the 1x42 Delta draws 6 amps of power which is really good. The 1x30 is 1/3 hp and only has around 3.4 amps. From what I've been told, the more amps the better.