I talked to one guy who had one (they haven't been out that long) and he loved it, but i think it's generally accepted that the marlin is probably a 'tougher' gun all around.
I like the look and feel of the timber - i played with one in 444 a little at the store, and it is nice and compact.
With the new 'leverevolution' bullets from hornady (spire points that work safely in a tube mag) both the 45-70 and the 450 suddenly pick up a lot of extra range. Should be some pretty exciting performance from them. Just makes it even more desirable to pick up one of those 'old time' lever designs