I have a love/hate with them. On the one hand they are very convenient, fast, and easy to use. I can pull out the torque value I need, I don't have to adjust anything, and I can use it on any hex tool I want, screwdriver, t-bar, breaker bar, etc. which makes it more flexible. The downside is by the time you amass enough of them for all your needs, they are no longer a small package and the price can easily go way over $400. I've seen them add a bunch of other tools (punches, flashlight, 1911 bushing tool, choke tube tool, etc) lately but I kind of think most are a gimmick.
Let's for example say you didn't want any of the other gun tool stuff and take the $180 duo kit, you still only get 15,25,45,65 in/lbs. Have burris signature rings or AI you need a 30 in/lb, have an MPX/MCX you need 40 in/lb, have a vortex scope you need 8 and 18 in/lb, lots of other mounts are going to require a 20 in/lb. Own an AI AT? that's 30, 35, 49, and 53 in/lb. ARC M10 rings, 50 in/lb. Own a Nightforce scope, that's the 4in/lb.
So if you own an AI AT with ARC M10 rings and a vortex scope, you now have to buy 7 extra torque adjusters, bringing your total to $460, $400 if you shop around. Plus you now have 11 torque limiters to keep track of, which won't fit into the case, so you have to drop another $40 on a larger case, and if you buy something else not in the list you are on the hook for $40 per torque value. Now I could see where it would be nice to have a kit specific to each gun in your gear, but now you are dropping probably $250 per gun to cover.
In the example above where you need 11 limiters, the borka kit could replace them all, or a $50 vortex torque screwdriver could replace most of them.