Join Date: Sep 2005
Location: New Westminster, BC
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We installed a Beckson screened opening port (cockpit mounted for aft cabin) a few years back, and just this summer replaced two "Lewmar" (structurally similar but no markings - suspect some sort of knock-off) with Bomar hatches.
The Beckson's been fine - no issues whatsoever in 4 years but of course it never gets flooded by green water as it's in the cockpit.
So far, but it's only been a few months, the Bomars are holding their own and have not leaked a drop (unlike their predecessors). They fortunately fit the existing deck cutouts pretty much precisely and were an easy retrofit. The screens are a bit dodgy - not the tightest fit and the glue has parted on one corner of one already.
We went with the Bomars mostly based on the price and the type of sailing we mostly do - salt water but otherwise similar to your use. I'm sure that for serious offshore work these hatches would not be adequate, whereas the Lewmars (at nearly twice the price) would have been.
1984 Fast/Nicholson 345 "FastForward"
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)