Hearthstone Windsor Bay Insert

I've worked on a couple of em in the past. They seemed
like a nice unit, but a PITA to work on. IIRC, a BIG HEAVY cast
bay front, requiring removal of 4 long screws in order clean the
glass or to to access the innards. Tight working conditions for those
service techs with large hands...
You hafta let everything cool completely before working on it, or
it'll reverse vent on you when you fire it back up...
Probably more than you need to know, but that's my story &
I'm stickin to it!

There are better ones on the market, but if you're driven by the price, go for it.
The co-axial liner kit will probably cost you $300, unless the seller has the original
& it's still in decent shape. The front will be a pain the first couple of times you have
to remove it, but you'll get the hang of it & generally, you'll only have to remove it once
a year if it's set up correctly. As a trained service tech, I wouldn't be against buying it
for that price, but I don't know what your skill sets are...