I splurged and got the X4D with bluetooth. It's handy, I have my one boat app and the Fish Hawk app on my ipad, it's nice extra screen for that stuff. This was my first fish hawk and I did have some issues setting it up and getting working right. I was getting all sorts of wild numbers or blank screens, thought it was the probe moving in and out of the cone of the transducer at first, but I'm running 12 lb balls in 50 FOW, blow back isn't that bad at 2mph. I fiddled with the transducer angle and that helped some, but it would still be weird numbers.
Let my ignorance be a help to other people down the road who are searching for answers. Two BIG things: 1) make sure the probe is right side up (I'm an idiot) so it's shooting the beam back to the boat and not to the bottom of the lake. 2) there is a gain setting in the display that should be 15 as the default and mine was set at 5, which was too weak of a signal.