Buy that Savage you won't regret it.
I bought one a few months ago. This is my first in line, though I have lots of experience with black powder, as well as with center fires.
This is a rugged and well made rifle. It is very accurate. If you aren't getting less than 2 inch groups, something is wrong. The third group I fired was 1 and 1/4 inches. This is with a 250 XTP coming out of the muzzle at 3,000 foot pounds, an astonishing amount of energy for a muzzle loader.
The rifle has a good safety that is easy to use. The bolt closes to completely enclose the breech, unlike many in lines in which the breech is exposed to rain, or a twig could get in there and block the thing from firing. Not so with the Savage. And with the safety on, the bolt is locked closed, a feature I really like when going through thick brush.
The Savage is more finicky than any other muzzleloader. You have to have just the right sabot and slug combo. Lets say you just grab some .50 XTP with the green sabot. Bad choice, they won't be accurate. You need the .50 XTP with the black sabot, in .452. The good thing is, there is great tech support for this gun on the Savage web sites. I went over there, picked the brains of the experts, and the first powder and bullet I tried were dead on accurate.
Another thing I like about the Savage, it is easy to get an aftermarked wooden stock for it if you don't like the plastic stock. The stock that Richards Microfit makes for the Savage 10 centerfire action will fit the muzzleloader, you just have to rout out the wood for the ramrod. You can get a beautiful maple or walnut stock, made to your length of pull and with the recoil pad of your choice, for under $100, then you have to sand it and put oil on it. I don't know of aftermarket stocks available for the other plastic inlines, such as Knight or TC.
Last but not least, praise God for a muzzleloader you don't have to clean.
ps it is also very easy to load the 209 primer, and very easy to unload after firing. Half the time when you work the bolt the old primer just pops out. No need for a capping tool or a "disc".