First thought: it is quite large. Second: really huge! :-D Third: although the difference in size compared with the Rebar is clear, the difference in weight is not nearly as big, so paradoxically it feels lighter in the hand than the Rebar, even though the latter weighs about 90 g less. First, a comparison with the classic ST300 (without the M): I miss a wood saw on it. The bit holder is fine, but the included plate has only imperial sizes for the hex keys. That may be useful for American firearms, but apart from that it is of little use here. The rest of the tools perform well, and the pry bar impresses with its solidity. As for the comparison with the Rebar, I will skip size and weight because that is obvious. Structurally, I see three main differences: 1) in the ST300/M the blades are secured when closed by a protrusion entering a hole in the blade, similarly to the detent ball in a liner lock, so they will not open on their own and even opening them by hand requires a bit of force. Thanks to this, there is no risk that with the pliers open, after a fall or when swinging on a lanyard, the blade will unfold by itself, as can happen with the Rebar. 2) The blades in the ST300/M have a lug under the cutting edge that rests against the inside of the handle, so the blade does not come into direct contact with the steel. In the Rebar, the cutting edge touches the steel interior of the handle. 3) The Rebar has springs in the handles that keep the multitool in the closed position, whereas the ST300 spreads open by itself because it has no such springs — a pity. In summary: the ST300M and the Rebar are very similar to each other. In my opinion, the Rebar is the best EDC multitool Leatherman has created. The ST300M is an extremely rugged piece of equipment, with the M version aimed mainly at firearm-related applications. If refreshed versions of both models ever appeared, they could adopt the best solutions from each other. I would add to the Rebar a lock for the blades in the closed position, as well as such a protrusion so that the cutting edge would not touch the inside of the handle. To the ST300M I would add a spring that keeps it in the closed state. Do that, Leatherman, and I will probably buy something else from you. :-)