I service trailers as part of my duties at work. I wouldn't be against brakes on the trailer, but I would try not to dunk the axle if I did have brakes. I have seen electric trailer brakes and hydraulic trailer brakes on dedicated boat trailers. They have a short service life if they get wet regularly.
What you are towing with plays into this equation as well. If you are towing with something downsize (Tacoma, minivan, Ranger, Subaru, Jeep) the extra braking power might be welcome. Behind a fullsize, I don't think you are going to gain much with trailer brakes. If you are experiencing trailer sway and you have to use the trailer brakes to straighten out, the trailer is probably not loaded correctly, and you are using the brakes as a workaround to your tongue weight problem.
Hope this helps.
Wishing I was on the river instead of surfing the web...