I think you will be very happy with it. My girlfriend got one and let everyone try it out to see how easy it was. I was the only one who refused, since I know I'd just end up drooling on her machine and then go home and cry over how badly I want one. No sense doing that to myself. All my friends ranted and raved about how wonderful it was and how easy to use. From their reactions, I think you'll be happy.
If you need a reason to justify the purchase there are a couple things you can do. Either you can make several charity quilts to give away every so often or once you learn how to use it you can quilt for others. You don't need to make a huge business out of it, but I bet you could do a quilt or two a month and then use that money to "repay" yourself for the purchase. Just a thought.