CVA Firebolt - good or not?

I looking to buy a new muzzleloader and wanted to know if anyone had experience with or knew anything about the CVA Firebolt 209 Ultra Magnum. I see it is advertised for $219 in the Cabela's catalog. Is it a good gun? Reliable? Accurate? I have heard alot of negative comments about CVA but don't know anyone who actually owns/owned one. Also, is there much difference between the accuracy of the .45 vs. the .50? By the way, I intend on hunting mule and whitetail deer with this gun. I appreciate any help. Thanks.

hunterpat