The Rock Slide TRS-JLF Joey Landreth Slide

I got this to start learning slide and compliment my glass slide. Also because it will instantly enable you to play like Joey Landreth (please contact TRS or your chosen god with any complaints).
Pros:
The inner is bevelled so that it fits on the pinkie perfectly.
It has a cutaway at the bottom to enable the free movement of the knuckle
It has a groove cut into the side of the metal to enable the ring finger to sit snug and hold in place
It's a great size.
Cons
Not really a con, more a preference - it's heavy! If you're looking for a light slide, get a glass or maybe ceramic one. this is a nice chunky piece of brass.

I've just started with this, but so far it fits beautifully and is inspiring me. It is for the PINKY finger. This is important. If you play slide on another finger this may not work for you. Also while it fits perfectly on my pinky, if your hands are very large or small that may not be the case for you.

I find it short and tight on my pinky. The cutout is a nice idea to help ergonomics. The notch that's supposed to be for your ring finger does not align with the cutout for your knuckle. When you align the cutout for the knuckle the notch for the ring finger is pointing at 10:30 o'clock, instead of 9 o'clock, I hope that makes sense. It is also a bit tight as well - at the top 15 mm of the slide the wall becomes too thick to stick your finger further into, so the fit feels tight on the finger and almost too far out, making it feel as if it will come off. This all makes for a bit of getting used to, if not uncomfortable.