I bought this to complement a recently purchased lap steel guitar. I had initially tried to play it with a standard guitar Slide both steel and Glass which does work but is extremely awkward and falls of at either end of the six strings as they aren't the width of the strings. When I received this product I was amazed how heavy it was. It was so heavy it had broken the plastic holder in the case it came in when it arrived, which incidently is a good addition for storage. When I placed it on the strings and got used to the new approach of holding it I was amazed at just how dark,swampy and sinister the weight can make the headstock end of the lap steel sound. Very pleased with this purchase already. It also is useful up the neck for a brighter country style sound. I didn't give this full marks as i feel the Tonebars with additional grips are better and easier to use, but also 3 times as dear.
It could do with a ridge to rest ones hand against as it does get a little tiring squeezing onto it all the time but I'm sure it's something I'll get used to. Aside from that, this is crazy cheap compared to other similar parts on offer here.
One thing worthy of note, though, I bought this to go with the Harley Benton Slider II and didn't actually realize that one came with the guitar, anyway, so now I have 2 ! Still, spares are always handy and at this price I don't begrudge it enough to return it so I'm keeping it until I lose the other one ;-)