I use both JASA collars and e-collars, but only after a very deliberate introduction. I'm using the JASA collar more and more these days, since the dog controls the pressure, I am better able to focus on my timing and posture. The e-collar works well as a reinforcing agent, but only after I know the dogs knows the command, and failed to observe the correct response by choice versus a judicious use of enforcing commands from the start. A great example of this is to watch George Hickox use an e-collar for teaching a dog to kennel. This is NOT a good example of productive training technique for a Drent, for 99 of 100 people training 98 of 100 Drents. That method is way too much pressure for a Drent, even for a Pro like George. A Drent is not a remote control car so training him like one, or to be one doesn’t suit the breed or its character.
Drents are great all-rounders, and I am confident there isn't much you can't train one to do, so as long as you have patience and a willingness to turn work into play odds are you will be successful. That is what they do – so when in Rome…
I'm just a guy suffering with an infatuation with gundogs since childhood. Fifty some years later this is what you get.