I own a TOPS BOB (or 'Fieldcraft by Brothers of Bushcraft') in 154CM:
It a great bombproof knife. It's indeed more than a prybar than a knife. That's ok though, because that was what I was looking for. (a knife for scenario's where I know I would abuse it a little and won't have time to maintain it). It's pretty sharp for a prybar, actually.
The ergonomics are really great, especially for such a big knife. It's heavy though.
I'm left handed, so I had to ghetto-rig my own sheath.
I don't much like the convex grind. If you are processing wood that contains sap, it wil leave a line of hard to clean gunk. The shape of the blade/grind causes this to accumulate in a straight line or ridge, and after a while it builds up and hampers your cutting. It was also a little on the expensive side.
I don't regret buying this knife. However, TOPS other designs don't interest me much, so I don't think I'll be buying a lot more TOPS knives.
P.S. It must be close to halloween as the spooky thread necromancer is on the loose!