Apologies for responding despite not being a GB owner, but thought the question was more generic.
Solely as food for thought (versus a recommendation), I went with a self-tailing sailboat winch instead of an electric winch. NOTE - in my opinion, max is about 250 lbs of dink + outboard. I just never felt like I could rely on my electric winch to operate after sitting for a while, though perhaps there are better models than the ubiquitous Rule winches of years past.
Despite being manual, a decent sailboat winch is not cheap. I went with a new Andersen 18 self-tailing that I found on sale a couple years ago for around $450 (they are now over $600). A 28 would have been a better choice ("18" or "28" is the mechanical advantage). In my opinion, also requires installation of a rope clutch to prevent accidental deployment.
Benefit of lifetime service is obvious. But there are a couple serious disadvantages too. First, to lower the dink, you 'belay' the line meaning you let it slip around the winch by loosening the line. Fine for ex-sailor. Not fine for many (not sure my wife will be comfortable). And it does take some strength, though I have a snatch block to form a 2-part lift to halve the effort
electric winch. Also, can use a beefy cordless drill instead of manual handle.
Not for every taste, but I offer as an unusual option.
Peter
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