I guess this would be a "price check" and also your opinions.

This is the 2d muzzleloader a guy wants to sell me. Hem-Haws on the price too. But he's thinking around $600 and I'm thinking more around $200.
The rifle is in excellent condition and looks to have been hardly used/fired.
I've looked around on the web to see what I could find, and the pro/cons flex around quite a bit.
The reason I'm thinking $200 is because I've read you have to almost completely take it apart to clean it properly, and it's a chore to do.
That and you get a lot of blowback gas in your face when shooting it.

I don't know anything about the cons of these muzzleloaders, so, I'm hoping some of you have or have had one that could guide me in it's worth,
or should I just stay clear of it?

Thanks