I spent about 20 hours researching this over that past couple of months, but I don't know if we are shopping for the same stuff....
I was coming from a RayMarine WiFish - so even further down the ladder than the dragonfly as I had to use an iPad in a waterproof case as a screen...
I ended up with a RayMarine Axiom and a Airmar Chirp M285HW transducer...probably overkill but I like to shop once and keep it for a long time.
Happy to help with any other questions if I can, I am far from an expert. I used the new rig at the Heroes on the Water event this weekend and while I caught no halibut I felt like I could SEE way better under the water - found bait easily, saw structure, now I just need to learn how to fish better...
BerleyPro is a great resource for fitting various transducers in the hobie mount on the bottom of your yak if you have a hobie
https://www.berleypro.com/product-category/hobie/
Some great background information on fish finders and sounder info in general
http://www.furuno.com/special/en/fishfinder/topic8.html
Some Great discussion of the current crop of finders and all their positives and negatives
http://www.ausfish.com.au/vforum/sho...ghlight=simrad
Another long article by same Aussie (about 4 posts down) that discusses various sounders and MFDs
http://www.ausfish.com.au/vforum/sho...owrance+garmin
Some fairly detailed info on the technology - bit long - but good late night reading....
https://www.thehulltruth.com/marine-...explained.html