No, no, I just used good quality pot. After it depends if you build a High-End stereo amplifier or a guitar amplifier.
For HE I use ALPS pot and for guitar I use Japanese Alpha pot. Of course after some years you can ear some scratchy noises but not after few hours of use as on my AC15C1.
He Vox guys, why to use that cheap pots rather than a few better model ? Ok, I know the answer : price. But I'm not sure that justify the choice. Honestly I prefer to pay couple of € more, having something ready to use for long time rather than to be, first of all disappointed and then to have to modify my guy to meet my expectations.
I guess it is not only a marketing choice but a choice coming from the product manager (nothing personal guy). This is the new law : cost reduction, better margin... Finally, all of that is normal else year after year the brands disappear and I'll always be happy to buy Vox.
As my grandma said : If you buy Chinese, you got Chinese ;-)
That said, have a nice day and enjoy the guitar.