I own, and can give some review on the SOG B61-L. The difference between the B61-N and B61-L is the sheath: "L" means a leather sheath, "N" means nylon. If you have the choice, get the nylon sheath. The newer versions of the L have a super-crappy sheath.
I got the tool because I wanted something that will cut wire easily, and have some other light tradesman tools readily at hand. The SOGs (any of them) cut wire better than any other tool out there, because of their compound lever action. It's really much less effort, so if this is a task you need to repeat, a SOG is the tool for you. It's something like an 8-to-1 ratio on most tools, and 14-to-1 for a SOG... almost twice as much force in the plier head for the same amount of grip strength. Also, with a little practice, you can open the plier heads with a sort of butterfly knife action, holding one handle, and flicking the tool open.
That's the good news.
The BAD news is, to get that compound lever action, the handles need to move farther. This means the jaws don't open as far while it's held in one hand. You can spread them out, use two hands, and open it up VERY wide, but not in one hand. And they're not spring opening.
All the tools on mine are, IMO, excellent. It has: saw, awl, wide flathead screwdriver, #1 philips, can opener/small flathead, 3-sided file, scissors, half-serrated blade, and a socket driver. The driver takes a standard 1/4 inch socket. I bought an adapter for a few bucks that allows me to fit hex bits. All of the tools lock open. The socket drive will also lock in a half-open (90 degree) position. Now, when I say the tools are excellent, understand this is from just basically initial testing. I haven't taken this thing out and put it to serious use.
The tool areas have covers on them. This makes the tool more ergonomic, but adds one more step to get to any tool you want (open tool, open cover, extract tool). Some people remove the covers, and they will just pop off with no tool needed to remove them.
The weight on this tool, as listed on the SOG site is a hefty 9.6 oz.