It really depends on what you'll use it for and what you expect out of it. If you just want it for a muzzleloader, it's one of the best out there IMO. I have an Encore Endeavor and LOVE IT! The only aftermarket part I've applied to it is a Bellm oversized hinge pin and it's dead accurate! If you're wanting it as a centerfire rifle, it's kind of hit/miss. Some people have gotten some great ones right out of the box. Some people have had to invest extra money in hinge pins and headspace kits to make them function properly.
IMO, if you're looking for strictly a centerfire rifle, go with a centerfire rifle. If you want a great muzzleloader, the Encore is a great investment.