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Gosh! Time passes quickly when you are enjoying yourself - My VWR engine mounts have been in since last July.
So, quite a few months later I can report that I'm still as happy as the first day these were installed. I think they may be fractionally quieter but not, thank goodness, losing the glorious Grrrrrr. Sound is very dynamic anyway and the frequency levels and reverberations will change according to many variables and that, of course, means according to the unique package of goodies you have under your bonnet.
Apart from my fairly recently installed Forge Twintake, I'm now also hearing some nice whiney transmission sounds - Doubtless the diff. This is not a mod for everybody but more for 63yo racing driver fantasists.... Well, in truth, for the more hardcore enthusiasts.