Thanks Wrigsby. Silly thing is, she's fine as she is. I'm all for preventive maintenance and 'upgrades' that make the bike better. I'm in my 60's & drive like Miss Daisy and embarrassed to say, a dry weather biker only these days. I just thought for £80 it's a cheap, easy to do 'upgrade' that may benefit me &/or the bike. Looking back over past threads & comments, there's far more positives than minuses that I can see.
And easily reversible if for some reason it doesn't make a difference for you...