I've read a LOT of reviews and I'm thinking of getting the Dragonfly 5 PRO. There are several things I like and I'm intrigued by. I'll be adding it to my 24' Pontoon. I would go with the 7 PRO, but cost is an issue.
Most of the real-world reviews seem quite positive, reviews of the set-up are good, reviews of the images are amazing, and appears to be very durable with many using it on kayaks.
Most of the negative reviews aren't from any real-world experience. Just comments about the look and feel or the simple interface from the "unboxing" (not actually using it). There is one hilarious review from some redneck that seems dead-set on tearing it down. Complaints about plastic, complaints about 'made in China', and complaints that it isn't "commercial quality" (how can you expect "commercial quality from a sub- $500 sonar?). Kind of an entertaining video to watch, and I could pick it apart all day. :)
I really like the reviews of how accurate the imaging is, especially in CHIRP. I also like the idea that I can wi-fi the screen info to my phone or tablet to see it on another part of my boat, which can be an issue if I'm drifting or anchored and have someone fishing from both the front and back of a 24' boat.
I would love to find someone that has actually used this in Utah waters. I did try the search function and only found a couple of posts from someone using an older model a couple years ago. They were very positive, though.
Any input is helpful.