Goose,
Near as I can tell, it's pretty hard to compare a VC cat stove to a BK cat stove. I've never heard any rave reviews about the VC cats, but I don't think I've ever heard a bad thing about the BK cats... just lots and lots of praise.
I believe the person you were referring to that recently replaced his smaller stove with a BK might be Rich L. If so, he's gone through a handful of stoves in the last year trying to find something that will heat is drafty old house in MA. I believe this includes the Woodstock Fireview and Classic, Hearthstone II and Mansfield, and the P.E. Summit. I think the previous stove before the BKK the Woodstock Fireview, which I think he returned back to Woodstock after using it for months and found it didn't meet his needs. The BKK seems to have done the trick.
There actually many BK owners in the lower 48 states. I personally know of 4 BK owners in CT and MA alone, and many more here on the forum. Despite being a big heater, the BK cat stoves are very flexible. In fact, you can generally get them to burn lower then many traditional secondary burn EPA stoves since they have an automatic thermostat and cat. This coupled with the large firebox is why the BKK is capable of burning over 40 hours on a single load of wood. Testing has shown the BK will burn cleanly at a 7000 btu average output and do so for up to a couple days on a single load, this is something you just can't do in other stoves, especially a non-cat stove. So while Wolkkiller can heat his 2500 sq ft place in North Pole with outside temps down to -45°F with only a BK King, that same stove is able to heat a much smaller area in the lower 48 in much more mild conditions w/o blasting the owners out of the house. Is it overkill to install a BKK in a <1500 sq ft home in the lower 48? Sure, but it's flexable enough to do so w/o blasting the owner out. The BK might not be the prettest girl on the block, but its certainly one of the most flexaible and funtional stoves on the market... IMO, it doesn't have an equal when it comes to all around performance.
Greythorn,
Your BK will produce some massive heat when called to do so, but it will not burn low and long like the newer BK cats. But if you need heat, that stove should be capable of generating in spades... just be ready to go through massive amounts of wood keeping it fed.
BTW, I would use double wall pipe all the way up. This will keep your flue cleaner and it offers an increased safety margin.