I've been running a set for about 4 or 5 weeks. Car is smoother, quieter and *seems* to accelerate quicker (that might just be the new shiny toy syndrome tho)
Don't think you need to put heat shrink round them, i have, but so far, none of the grub screws or pins have shifted.
And they just dropped straight into my 410R with no issues (and will drop straight into the 2010 i have too, once i buy another set.)
I don't know if its a worthwhile upgrade exactly, as they are v.expensive, but if you a) have the cash spare and b) need a new set anyway. Go for it.
I got mine from Tower, with a bulk discount and a voucher, so only paid about £40 a set in the end (bought a set for OneKiwi as well, he may have more to add)
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