I?ve tried out a number of slides. Glass, metal... long ones, shorties... Only one stands out... Dunlop 212. Why?
It?s lenght is (for me) perfect. I can cover one string or all six. No excess length. A bit on the fat side, not thin. It has a "light" heavy weight to it.
The most important "feature" for me; there is a resistace when sliding over the strings. Metal slides just slide effortlessly, but the glasses has this, I find, comfortable resistance to them, almost a bit sticky.
So, yes. Get it.