I haven't used the transducer mount yet, however, it is installed. And that is why I'm doing the review now instead of waiting.
I read many of the reviews online and anyone that had anything negative to say were all the same: fitment quality.
First, the wholes did not line up. They seemed about a 1/8 to a 1/4 in off on the long side. I had to take a rat-tail file and open the ID so that I could get the screws to bolt in.
Second, the spacer plate isn't thick enough. This means the cover wouldn't mount flush to the boat. What I ended up doing is using my dremel to grind down the part that extends past the transducer opening so that I could get a good flush mounting surface.
The reason I personally think this is an important issue, is we are talking about ******** into the plastic. I don’t want any pulling force on any of the bolt threads.
Third and last, the area where the transducer fits into the cover is too small. Not by much, but clearly it's a super snug fit. It's short enough that the plastic part that you bolt on to keep the transducer in place doesn't have a good mounting surface contact.
I've worked in manufacturing for quite a long time as a CNC machinist. These three things are super easy to address and correct. I don't understand why they would ask for reviews if you don't address the issues the customers bring to your attention.
On a side note.
On their web page, Jake B. gives a 5 star review and states "Fit perfectly to my kayak didn't need to modify it at all, strong durable and doesn't stick out below my kayak." The hashtags are "BerleyPro Vibe Lowrance and Garmin Sidescan Transducer Mount" This can't be a true review. If you look at the pictures on their own website, you can clearly see the transducer mount does indeed stick out below the kayak.
I know this sounds like I'm eating them alive, but for the price, wait time for shipping, and the amount of time it would take to fix these issues, I can't give a better review.
As for how it works? We'll see tomorrow after I take it out.