Takes a bit to get used to, but a great shoulder rig.
926219
Fantastic shoulder rig. Takes a bit of getting used to (just holding your hands up with the weight of a camera at that height can get awkward) but was soon a very natural addition to filming. I need to find an affordable counter-weight, all of the options that I've found are around $100 which seems a bit silly. Great product.
1472658
I like the harness idea, but this rig comes around your ribs instead of more around your waist, this is to me a little uncomfortable. I like the overall design that puts the weight on your shoulders, as well as to help keep your binocluars from bouncing or swinging out and hitting your tripod if you use one for a spotting scope.
2139583
Once you adjust it, it feels fantastic. It's a bit tricky at first, but once you learn how to adjust it you'll find the fit in no time. Great shoulder rest I don't think I can go back to the Everest or any other type of shoulder rest.
3931428
took a while for my hand/wrist to get used to but definitely less pain on the long run
2565785
First: if you like the vertical position, this rig is simple, comfortable, and does a great job. If you're of a certain build, it snugs in nicely and keeps things subtle. Because of the gripping mechanism it is a little thicker than some rigs, but you might not mind because the way it's made makes it more versatile than the manufacturer makes apparent.

This piece is designed to fit a few pistols, in particular a S&W Model 60. It's also listed for a Browning BDA .380, but they don't seem to want to answer whether it's good for a Beretta 84FS, too. Which is a little funny, since the BDA and the 84FS are near-twins.

This ships with TWO thumb-breaks, each equipped with "directional" snaps, and with two positions. I've found that it works fine with a Model 60 AND an 84FS --- you just need to swap breaks.

Back to thickness. It couldn't do what it does and be thinner, in my opinion. If you want a slender rig for the 84FS, go with the original Beretta piece. (Of course, the S&W will NOT fit in that!)

Bottom line --- if you have both pistols and only want to pack one shoulder rig, this will do it.

[EDIT]
BTW, this also works with the Walther PPK and PPK/S (per a viewer question).

This piece takes a little breaking-in, which is fine.

It also takes some "airing-out." Now, I love that smell --- but this leather is so beautifully cured that when new, you can smell it from 25 feet away. Takes a few days to calm down, unless you want to smell like a pair of new Italian sandals. (Which I don't!)
283800
Really cool . . . . once you get the hang of it.
1188639
A little tough getting used to it, but once you go it's pretty fun
81817
Far more comfortable than a standard camera strap, but I can switch to each body much faster.  I would highly recommend this rig.
834535
in the right position, this thing is a dream come true, but you've gotta get used to it in order to love it.
3685171
i love the price, and if u have a little extra $$$ u can turn this simple shoulder rig into a monster, shipping was fast, and packaging was great, overall the product is a five start for its price  i really cant complain.
4411413
Takes some getting used to, but after a while it starts to feel comfortable and unnoticeable. Design isn't the best, but there are many others to choose from.
2931148
Good product. i started using it and it's not that easy to perform this exercise as it seems. Takes a few weeks to get used to it and get the full motion. Puts strain on your shoulder so if you got any kind of shoulder injury or for any reason you can't strain your shoulder, stay away from this.

Cons:
1. Knee pad is basically a joke. I use a cushion or a yoga mat under my knees.
2. You would expect the spring to be strong enough to provide a good enough force during recoil but this one basically just give a little assist.
2639851
Just finished my first week using the 2535 and still working out the kinks. I find myself getting more comfortable with location of the tools and definitely spend less time looking for tools as I did with my more traditional framing rig.
  First things first, this is a suspension rig as much as it appears to be a vest. It adjusts to width well and fits best over a jacket or sweatshirt than a t-shirt as shown in the picture. I have a 44 inch chest and even with the adjustments it's still a bit big when wearing thinner layers.
  It's very well made and designed with many different slots and pockets. There are slots behind the upper velcro pockets that are great for a traditional utility knife or keeping extra tools (knife sharpener in my case). The chisel case fits my chisel snugly and has a smaller space for my scratch awl and I can tuck my cat's paw behind. The phone case is a joke in the day and age of our monster phones but it my Bosch laser measure fits in there and is cozy and safe. The side pocket below the "safety glasses pocket" on the left breast is removable so it could be replaced with a more snugly fitting tape measure holder and the bag can be moved to any of the loops at the bottom of the vest. I purchased an extra bag to hold my speed square and fasteners and it hangs very securely on the loops. When I'm all loaded up the wide shoulders help distribute the load evenly and having so much stuff close to your body makes it all feel lighter.
The only thing that has been a bother is the when you bend at the waist, things not pressed firmly into their pocket can slip out. The pencil pockets are most susceptible to slippage (today while looking at the second floor rim joist I lost two pencils and a sharpie to gravity) so maintain proper posture and bend at knees when picking stuff up off the floor/ground. Interestingly enough my heavier items (chisel, knife, awl, cat's paw) never fall out. Also, have been carying a drill bit in the designated upper right leather slots and never lost it once.
  I bought this hoping for a less bulky option to my framing rig and found it to just be a more comfortable framing rig. I was thinking I could maybe use it for smaller finish carpentry or home repair jobs but I'm wary about losing a loose tool on a hardwood floor.
  This is a good tool suspension system for serious construction work and is appropriately priced for the quality and craftsmanship but if you are looking for a lightweight non bulky tool vest for DIY projects this isn't for you.
4822696
Cumbersome at times, but it's much better than the neck strap.-
2479968
It's tricky to get used to because of the spring button that you have to use to activate the mag but after you get used to it it's okay and it holds a lot of ammo compared to the other guns
391214
The offset mount is great. Solid construction and adjustable, just nicely designed. Unless you have something that requires two rails on the back end, like a counterweight or batt pack, the two shoulder pads just don't work ergonomically. At no point do both rest on my shoulder. Not a problem, really, just not sure it was very well thought out or worth the money.
2281685
First rig, so I cannot compare with any others, but I can say this rig is great. Able to change into just about any configuration you prefer. Currently, I have the cage perpendicular to the matte box using two 90' rail brackets I had from before. With camera, and all gear attached, it seems sturdy enough for the work I do, but it is pretty heavy. Have received many stares when out shooting with it, which is great, because people ask about what I do, and I am able to give them business cards, which has brought in more clients. Sturdy, but seems the cage might break if dropped. Would prefer the cage to be made from aluminum, as I think the weight would be about the same; but again, what do I know, this is my first shoulder rig. I would recommend this for anybody looking for a shoulder rig.