I was a bit hesitant due to the small size. I have a Dunlop 227 which has a thing on its own but clunky as hell. I was in the market for a glass one for some time and am glad with my Ernie Ball purchase, having saved some bucks instead of going with Dunlop.
I'm a 183 cm guy who has leaner fingers and a slightly shorter pinky, which was my main purpose in buying the small slide. Pinky is comfy inside and I can curve it while soloing which is a relief. Besides, the slide fits perfectly on my ring finger too, and sits right at the end of the second finger joint. It doesn't feel tight yet doesn't lean to fall.
I would definitely buy it again.