I’ve had a number of them over the years, both the Skyscraper and regular size. For me, their sizes really catered to my hand position on the palm keys and not as much to the actual size of my hands. For me, I found that I needed a larger riser on the F palm as my hand was considerably far away from it. I put the Skyscraper on that and it was the perfect height to reach my hand eliminating my need to stretch and reach far. I also did use the regular size on the palm D and Eb and found they were good, however the shiny lacquered finish on them actually made my hand slip at times so I didn’t end up keeping them. What I ended up doing, which might help in the end if you decide to get some and end up experiencing slipping, is to take light grit sandpaper and shave off that layer of lacquer so that the riser doesn’t slide as much in your hand. Just a tip. But they are great risers IMO, definitely check out the size differences between the models before buying.