Good review, eyesmiles!
Just got my Kul ES-87 with mx clears. This is the first time I have tried clear switches, and I didn't like them at all. I tend to bottom out on all other switches, but clears punish your fingers for attempting this. To me, the switch feels like mush with sand in it. I was glad to get back to the 55g Topres on my RF 87u and the capacitive buckling springs on my IBM XT board.
Apart from the switches, one thing I didn't like about the Kul ES-87 itself was the mini-USB connector in a recessed area on the underside of the board. It is very difficult to get a standard mini-USB plug into the recessed receptacle. Luckily, the connector on the furnished cable is shorter than normal, enabling it to fit, but it is still not a smooth operation to plug or unplug the keyboard from the cable. While there is something to be said for cable routing, I would prefer to have an easy to reach connector on the back of the case rather than on the underside.
If I could find a Cherry mx switch that I liked, the Kul ES-87 board would be okay. The quality appears to be on par or better than TKL boards from CM or Filco. I really appreciate the abundance of DIP switch settings, which enabled me to bypass using software to swap CapsLock and Control, Alt and Win/OS, Fn and Menu, and even Backspace and Backslash. All the keycaps for these swaps were provided, although I would want to replace the stock lasered/infilled ABS caps with a dye-sub PBT set.
Another plus for the Kul is its ready availability through several different sources, including EK, Mechanicalkeyboards.com, and Amazon. The price is also reasonable and free shipping is available through MK and Amazon Prime.