no offense to you - but I disagree.
My bike was originally a stolen recovered and had scratches down the RHS of the tank... My guess is it got bounced about in the back of a van when it was stolen.
Rather than go through the expense of having the tank resprayed I bought a Bagster cover to hide the damage... it does that job exceptionally well. BUT - the whole tank is now 'dull' (best word to describe it) the bagster cover as well as hiding the damage has done further damage to the paint. It doesn't bother me too much - I can't see it. However there is no way on earth I would ever use a Bagster cover on a pristine tank. Unless of course I couldn't live without a tank bag... but even then I would look for any alternative I could find before fitting another Cover.
nb even the best quality wax polish I can find has not improved the paint thats been dulled... Bagster covers DO have their uses - I don't deny that - but as protection for the paint. they're useless.
all depends on how fussy you are though I guess.