Gateron Yellows (50g)
Stock keycaps (ABS)
The KUL ES-87 is a super-solid TKL keyboard. This particular example has a smoke black case and originally had Cherry MX Blue switches. The r/MK user from whom I purchased this board, /u/honeynugget, desoldered all the MX Blue switches and replaced them with the Gateron Yellow switches it has currently.
Gateron Yellow are one of my favorite linear switches. They hit a sweet spot on the force scale for me, and their smoothness is rather pleasant.
On a related note, the customer service at Keyed Up Labs (KUL) is outstanding. One of the rear riser legs on keyboard broke. When I contacted them they were quick to send me a replacement leg free of charge, and sent a follow-up email to confirm receipt and satisfaction. Kudos to KUL!