Hi Chriso,
loved the images from your recent trip! My 60mm AF-S just jitters when trying to Auto Focus with the Kenko TC. When I re-read about some
Canon users getting the Canon 60mm EF-S to work with a Kenko TC by putting a 12mm Extension Tube in between I wondered if I might have
a cheap option to get more than 1:1 
Just wishfully hoping that someone has had success with the Nikon 60mm AF-S + Kenko TC + 12mm Extension Tube combination.
The FIT Diopters do look great and I've been very impressed with the reviews and images I've seen taken with them. It certainly is an option for
me, just a hell of a lot more expensive.
Cheers,
Jim.