Yes, I use one on my ZX190 and I love it!
It helps a ton since I fish by myself most often.
1. I can back the boat in until I see it float off the trailer, hop on the boat, start the engine to make sure there are no problems there, pull the release lever, and I'm off the trailer without having to rev the motor in reverse to get off.
2. When I load I just power up to it and you can hear it click/lock.
3. With a partner backing me down, they do not have to get out of the truck to unhook the boat and I don't have to get off to unhook the winch. I just pull the lever and I'm off.
4. When loading with a partner, I just power it up until I hear the latch click and partner just pulls me right out.
5. I don't depend on it when I'm trailering so I still attach my winch strap when traveling.
Lake levels fluctuate and every ramp is different so it's not always the same when positioning the trailer where you think it should be and sometimes I would back it in too far or not far enough. It was always a pain playing the game by myself of having to get back in the truck to reposition the trailer so I could get the boat on and the worst was when I had the trailer in too far and when I walked up the deck to latch the boat it would slide back off the roller.
I don't have to worry about this any longer and launching by myself is a breeze and I can launch and load very fast.
I have not done this yet but I will be in need of new bunk boards soon so for the next set I'm going to add some slip pads so that's effortless powering up to latch and load because I don't have to worry about the boat sliding off the trailer before I can latch it.