I've got a MAPP setup as well that I use to heat stubborn exhaust system nuts/bolts and things of that sort. It's a good deal for some hard to reach areas where a full-size torch won't fit. Unfortunately, the hoses aren't long enough (as someone mentioned) so you can't always use it for that.
I ended up buying a larger oxy/acetylene torch setup for around $400 that has paid for itself due to the excessive oxygen cylinders I was going through trying to cut through bigger stuff.
It's nice to have the MAPP option though when I don't feel like dragging the large cylinders to the work - I'm going to build a cart to solve that problem soon though