The main advantage to the Kila v2 detents (in my opinion) is that they don't have plastic balls that are push-fitted into the housing from the front, and can as a result be blown out the front if the circumstances are correct.
Instead, Kila v2's have a cylindrical piston that is loaded through the outside of the housing and secured into place with a threaded cap. This prevents the internals of the detent from ever blowing out, since they simply don't fit out the hole on the inside of the housing.
The disadvantage to this, however, is that the pistons don't roll around inside the housing like the regular ball-based detents do. Becuase of this, you can't install the detents too deep into the chamber. Use o-rings to get them the right depth.
If you put them in too far you will have a lot of wear on the heads of the pistons, or worse yet have bolt stick.
This is a picture of my Nerve with them installed a good depth into the chamber. Go no further in than these.
The other advantage to these is that the magnetic force can be adjusted. Basically what you do is disassemble the detent and remove one of the magnets to space them out.
Disassembly is pretty easy. Just take a 7/16" wrench (same size as gasline fittings) to hold the housing in place, then use a screwdriver to unscrew the cap. You will notice there is a magnet inside the cap...you can let this fall out and use it to remove the stack of magnets from the piston (flip the cap magnet around so it attracts the magnets, then pull them out). You can hold a maximum of four magnets inside the piston; that will give you the maximum return force. Take one out and you will have less repulsion force, take out another and you will have even less.
When reassembling, be sure to apply a small amount of thread locker on the threads of the cap, and drop the cap magnet in the proper orienation. If you have it in wrong, the piston will remain back instead of forward. Screw the cap back on hand tight.
Overall I think this is an awesome product. I have shot many thousands of round through my guns after first installing these with no problems at all (using every Shocker bolt available). As long as you keep them the correct depth in the chamber, I don't think you would have any problems with these.
If you are an upgrades freak like I am then the cost is definitely justified. However of course if you just want the basic working parts then a different brand of detent will certainly do the job too, just perhaps not quite as reliable.