Been a fan of K&K pickups for a long time but have used soundhole covers to eliminate feedback in loud band settings. I recently converted one to a James May Ultra Tonic & have been super impressed with the sound quality of the K&K without any feedback whatever.
http://jamesmayengineering.com
I will convert my other guitar with a K&K to the Ultra Tonic & will go full Ultra Tonic on a third that currently has no pickup.
No connection to James May but think the Ultra Tonic solves the major problem with the K&K style pickups, feedback. Did I mention it sounds great?
Frank