Lemme point out a few things that is obvious here. Namely that is a jet and they have some very good quality to them.
a) that is way over priced.
b) it wont do the job you need.
c) there are other, cheaper alternatives that will give you good results and while it may not be the overpriced 2x72's out there it will provide many advantages over any 2x out there.
4x36 allows for non-knife making wood working, larger objects well lets just say a 2x72 belt grinder falls grossly short in that arena. You can get models like this at harbor freight and sears for bit shy of $100
6x48 is about the same as the above but larger. Also these have flat disc wheels on the side. Harbor freight list this one for $200 with stand.