Has anyone fitted one?

What is the purpose of it and does it work?

General thoughts on if I should fit the one I have?

I am also interested in the answer to this question!

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I've got one fitted, but only because it came in a kit I bought. Not sure if it makes any difference or not because I had the wishbone bushes and coilovers fitted at the same time.

The steering on my car is VERY responsive tho!

I've got one on my MK2, and IIRC its very similar in design and purpose.

Will stop the rack moving as it would on a standard bush.

I might take a look at fitting to see if it does make a difference. I too got mine as part of a kit but never got it fitted. It's just sat at home gathering dust.