Sturdy bottom row keycaps when creating a 6.25 spacebar layout. The distances between the keys are significantly larger. Mainly because the spacebar is 6.25 and the Atl keys are significantly smaller. I changed the layout to 7U and the gaps are way better! Until I realized I was missing the 1.5 ctrl key. Sigh. I had to return for a refund. Edit: I ordered them again after speaking to Revain CS. They were sure that the second order would have the missing key. You were right. I have changed my rating from 2-4 stars. The gaps in the bottom row still need to be completed. But for the price I don't expect GMK quality.