I was finally able to pick up my M43i (the "i" for "improved") yesterday. It is my first Sher-made knife, and I am very impressed. First of all the quality is excellent, among the best that I have or have seen. I really like the convex edge.
The most impressive thing is the feel of the knife. I compared it to a standard M43 by Murali. The Sher version is visibly thicker, but thanks to the AK-style fuller it is or at least seems lighter. The balance point is farther forward on the Sher version, I guess since it is made with a standard tang rather than using slabs. The handle is a standard khuk shape rather than the usual M43 handle (or Colt SAA as Rusty likened it to IIRC) and has a slightly oval cross-section. This change makes the knife feel more secure in my grip, more resistant to twisting.
Anyways, I think the new M43i is an excellent knife and I can't wait to see other things from BirGorkha at the same level of quality!!