Anyone use this fishfinder? I was playing with them at Sportsmens yesterday. The 4 has all the features the 5 does, just a smaller screen and $100 cheaper. Not sure if the larger screen is worth the $100, the 4 screen will be a little bigger than what I have now. $50 rebate on them until July. I like how easy they are to run. I have been wanting to upgrade for a while now, did not want a complicated unit. These have GPS, and accept the navigation chips. I'm pretty sold on one, just wondered if anyone has any first hand experience.