We run it on Lake Ontario, and for dipsey diver fishing it's pretty amazing knowing where your divers are at. One day back in 2016 we noticed a 19' difference switching from an East troll to a West troll. I would also say the speed probe is a nice probe. It will give you a recent speed and an average speed, which is nice on rough days.
Check out Stealth Core at Fish USA. A very successful walleye captain on Lake Erie developed this. We use it on Lake Ontario and love it, and I've tried most other brands. Typically, Walleye don't pull much drag, so I'm guessing 150yds of 30lb braid will work just fine for backing. 25'-50' flouro leader between the core and the lure.