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I just want to say, having tried a ton of other silent switches after I tried boba u4, just don't, nothing compares
Nice build. 
How does it feel and sound? >

I love the feel of the U4s, they have a wonderful tactile bump with a very quiet and soft sound, worth every penny. With no mods to the case they almost have like a subtle yet thocky sound although hopefully with some foam and kilmat in the case they should get quieter.