Donny, you'll probably be satisfied with the .wma files. They are significantly smaller file sizes and probably require less computer horse power. If your not afraid to spend time staring at your pc screen...it's worth giving it a shot. They make it almost impossible to avoid upgrading every year due to the good deals they offer.
The integration with real band I found a little confusing...but I'm sure my adhd has something to do with that. I'd say go for it! It's cheaper than another keyboard, and who knows...maybe you'll love it!