I cruised Cay Sal Bank aboard the Nekton Pilot back in August 2002 and overall found it to be a very enjoyable experience. Mind you, however, we got lucky on two fronts in particular:
1. We had beautiful weather for each day and all but one night.
2. The boat only had fifteen passengers.
With a full passenger load (31-32), I think the dining / lounge would've been packed.
The Pilot is not new and my cabin, at least, reflected this. The accomodations are fine, but expect water stains on the carpets, and interesting molds, etc, in the corners.
The cabin AC is effective, but condensation from the unit has a VERY annoying habit of pooling on the ceiling tiles and dripping onto the bed(s) / floor (hence the water stains, I expect.)
Food was fine and very plentiful.
Diving on Cay Sal Bank-- visibility tended to be 50-60'. Blue holes constituted the 'core' of the dive experience. I found these to be rewarding, easy-to-navigate, dives with lots of healthy coral and fish. Lots and lots of sharks if that's your thing...
Crew was very friendly and knowledgable.
Tough to beat diving with a steel 95 tank. Airtime was basically a non-issue.
Was it a good trip? Yes. Would I dive the Nekton Pilot again? No-- I think I've experienced them under optimal conditions already and anything else (bad weather, full boat) would be a disappointment.
I'm off to try the Kona Aggressor II in two weeks.