I have been trying to find a spring similar to the gopolar yang springs, and these come incredibly close, they feel fantastic on the downstroke and very snappy on the upstroke. They aren't too heavy or too light. I didn't even need to oil these springs, perfect right out of the box. It feels so good when you finally find a spring that fits perfect for you, and these feel 99/100 perfect for me.
Have you got trouble getting it (heavy PBT 7u spacebar) up ? Then these are the springs for you ! Guaranteed to lift your spirits and your heavy keycaps to the fullest extent !
Seriously great quality, didn’t even need to lube them, perfect out of the box, snappy return, feels light on the downstroke and snappy on the upstroke !