My thoughts: If you were not happy with the muddy, I would also try to cancel the XOP. They seem nice, but are a cheap stick. IMO, the price of beast sticks continue to drop especially in the used market from what I have seen on here. They are nothing fancy, and just work. If that's all your after. Sales are usually often and should be due for one soon as I haven't seen one flash by in a while. Also watch the classifieds as there can be some good deals on them there as well.
I would anticipate more sticks hitting the classifieds here once all the new stuff comes out. Hope you can get your money back on the muddy. I would hope midway can issue a return.