Deeper or Fish Hunter Iphone sonar

Anybody have experience with either the Deeper or Fish Hunter sonars? I'm looking at a sonar to match with my iphone. I already use Navionics on my Iphone and like the simplicity/minimalism of an iphone sonar. However, I'm not sure of the real world capability. Pretty limited internet reviews. This set up would be for fresh water use.

I had decided on purchasing a Humminbird 175 Portable Depth finder. And that's still my number one choice base on need/price range.

I'm open to suggestions if anyone has any. Thanks for your time.