I had one...
the 3.8 air deck with a 20 hp Yam 2 stroke.
I sold it to help finance my current rib, but it was a struggle as I
really liked it. The 25hp 2 stroke Yam would have been plenty.
The 20 hp was fast enough.
Unless it was calm, the bouncing you got on the swells restricted your speed
for the sake of your spine!
It was a good sea boat, but tiring in chop. It took me and the kids from Skye to Rhum and back safely.
I cant speak for the solid deck version as I never had one.
There must be hundreds of posts on here about the 3.8 Honwave. Try a search.