I played around with one at a local shop. The best way to put it is, if you can do it with a drill then it may be faster. If you can't do it with a drill, it won't magically make you better.
I've seen people build their own jig out of the cases or boxes RDA's/Tanks come in. Just as long as it's light so it will slide like the jig does, then use a drill. You can hand operate the drill as normal, rubber bands, or a small c-clamp to run the trigger.
In the end it's all personal preference, no different than buying a regular coil jig or just using a screwdriver, to each their own way. Some people like gadgets and some don't care to spend the money and find another means to accomplish the same thing.