This is a very comfortable, good sounding slide. It has a well balanced tone, inbetween a glass and brass slide.
It can be used on electirc and acoustic guitars. Due to its medium weight, you don't need an excessively high action to get a good slide sound!
Gave it a 4 on quality because of the fact that if you drop this thing, even from a minimum height it will break. I accidentaly broke two of these, but nonetheless I find myself always buying the same product, a testimony of how great this slide feels and sounds.
If you want a slide that is a pleasure to play and sounds awesome, spend the extra bucks and buy ths one. Just take extremely good care of it!