Anyone had any experience of these?

builttospill

I'm thinking of replacing my stock vintage Gotoh tuners 
http://www.wdmusic.co.uk/hardware-parts-c1/tuning-machines-c28/locking-tuners-c31/gotoh-sd91-vintage-magnum-lock-traditional-tuners-6-in-line-p13312

musteatbrain

Not those specific ones but I got some specific height adjustable locking gotohs with an 18:1 ratio on import from Japan a few years ago and they were excellent.