I have one and I've only used it to occasionally set up a guitar temporarily for slide, because I don't play enough slide to have that good, delicate touch it takes to slide with low (enough to fret with other fingers) action. It's handy that way.
But because it's metal, it puts its own 'edge' on your tone, so you need to back off on the tone pot(s), amp treble to compensate. Also, glass or ceramic slides rather than metal...unless, of course, it works for your taste in sound.
In short, ahem, cough, cough...if you've invested in graphite, tusq or bone to improve your nuts, you lose whatever natural warmth those substances gained.
^^
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