Yes, I have a Hamer Newport which the PhatCat pickups were originally designed for. I can't say enough good things about these pickups, especially in this particular guitar.
They kind of cross the bridge between a humbucker and single coil. At times they sound humbucker-like and other times more single coil in character.
They are very sensitive to your picking dynamics, which makes them a great choice for blues playing, etc.
To me they have all the character that you would want from a P90 pickup but the warmth of a Humbucker. If you want to hear what they sound like just listen to some of the songs I have posted on Sound Click. All of the electric lead sounds on these tracks were recorded with the Newport.
I think that they would sound great in a 335-style guitar.
-- Jim