The Queen Mountain Man is a FFG blade. It comes in carbon steel (1095) or tool steel (D-2). It comes with bone or wood handles. It is a hefty knife but not nearly as heavy as a Buck 110. It carries better in the pocket than the Buck due to its lighter frame.
Here is mine in D-2 and bone compared open and closed to a Buck 110.
Mine took a LONG time with a diamond Lansky sharpening jig to get a working edge on it. The D-2 is a hard steel and all of the Queen's I have owned came with less than optimal, unevenly ground factory edges. The 110 will sharpen up easily, hold its edge for a reasonable amount of time, will bend before it chips and is extremely easy to field sharpen with a pocket hone (I used a Gerber diamond rod) and can be reprofiled easily in the field to repair a damaged edge.
I've had 3 Mountan Man lockbacks and 2 of them exhibited blade play. The lock is a lockback but looking inside the knife the lock bar is different than the locking bar on a 110. There is less tension on the blade when opening it than there is to a 110. In all, the 110 seems to be a much sturdier folder with a much more solid feel to the lock. I've owned several 110's and handled several more and fit and finish on every one was superb. I've handled older ones that were subjected to hard use for several years and only one exhibited blade play after several years but never lock failure (my brother's which he drilled the butt end to accomodate a bail for a lanyard.) You will most definately want to carry the Buck in a belt sheath (both the new style leather ones and the cordura ones are not optimal in my opinion, you might want to find an older leather sheath with the integral belt slit rather than the loop on the back of the new ones. It tends to slide on the belt and catch on things.) You can carry the Mountain Man in a pocket. That said, I love my Mountan Man and my 110.
If you don't need a lock, many Sodbusters come close to the size of the 110 and the MM. My Case stainless Sodbuster is FFG and the spring tension is tight on mine and it has black composite (delrin I think) handles. It is much lighter and slightly smaller than the 110 and the MM and the steel on mine doesn't take an edge as well as the Buck (Case Tru-Sharp stainless, 420HC I think, someone correct me if I am wrong.) This might be due to the heat treat on the Case, Buck's heat treat is SUPERB. I don't have pix of my sodbuster (it is in Massachusetts) for a comparison with the 110 and MM.
The 1095 and the D2 in the Queen will hold an edge much longer than the 420 HC stainless used in the blade of the 110. The 1095 will definately form a patina with use and the D-2 may as well, or at least exhibit some corrosion spotting (some say it pits, I haven't used mine yet, so I can't comment on that.) In my pix above the mirror polish and fingerprints in the oil on the Queen's blade (D-2) make the blade seem dark but in reality it is mirror polished. The 110 was used heavily on a commercial fishing boat when I worked as a lobsterman. It is in the same state as it was last time I used it on the boat, a fine testament to its ability to withstand hard use in a tough environment for a knife.
I will probably pick up a wood handled Mountain Man in the future but I want to use the Queen on the tug for a while to see how well a bone handle works in a hard use environment.
One more thing, the Queen will cost about twice as much as the Buck 110 and may be hit or miss on fit and finish. I don't think that you can go wrong with either knife though.
ETA: The Okapi 907e is a FFG locking folder in an unconventional, traditional, time proven design. Here is a review I did on one:
http://www.bladeforums.com/forums/showthread.php?t=583060&highlight=okapi
The large folder above it in the comparison pix is a Cold Steel Twistmaster, a modern take on another traditional FFG locking folder, the Opinel. It is discontinued and mine has a Carbon V blade (I think 1095) but it can be found on the secondary market from time to time. The lock on the Opinel is a twist ring. I don't own an Opinel but others on BFC speak highly of them. Cold Steel also makes a modern Okapi in stainless and FRN called the Kudu. Original Opinels are offered with carbon and stainless steel blades. I think the original Okapis are as well. Both the Okapi and the Opinel are very inexpensive knives.
Hope this helps,
Pete
