After nearly a week in the boat I'd have to say I believe the Permatrim has helped. Granted, it's all somewhat anecdotal, but the ride seemed to be the same with just the Permatrim (no trim tabs) as before, but before we had to trim the tabs all the way down to get a comparable trim/ride.
We used the trim tabs only for lateral balance the entire trip. I found that when we were heavy, a full or nearly full down engine trim, for flat water, worked best. Appeared about 2-3" of water ran over the Permatrim at about 12-14 knots, with full fuel/water tanks, a cooler, batteries etc in the stern/cockpit. If I trimmed it up under these conditions, I watched the GPS speed quickly bleed off, up to 1.5-2 knots w/ only a small adjustment.
Meredith's input was this: even w/ the trim tabs up fully she could now see over the dash/bow without stretching her neck or raising up in the pilot's seat as she had to do before.
Like I said, anecdotal, but I'm happy w/ the install.