I have had all three, ws on the old boat, Krypt on the new boat , zld waiting for spring to be installed.
I likes the ws a lot and ish I would have kept it, Krypt I got a deal on so could not pass it up, works just fine like the ws, want to try the zld to have more effective control over the system as the I should be able to set it and forget while out on the water. I find myself adjusting the previous two all the time tweaking the system. That can be good and bad.

my .02