FYI There is no "Upgraded" or "V2" Willsenton R8

Hard for the company to ignore the web modders of this unit who have been doing and showing their work online, and who have given their reasons for their work. Willsenton has been trying to compete in the market as a full-featured product brand but they have unintentionally become a producer of a product base for an equipment modding community who tear the units down and replace stock components and rework the wiring scheme, then move on to tube rolling. I am sure that isn't where Willsenton wanted to be. This started with end users trying to fix real defects in the product.

Willsenton made improvements in component quality and resistor placement. The overall design as a KT88/EL34 push-pull octal tube design didn't change. The amp has been a successful product in its original production and will presumably continue with its un-announced improvements.

Companies are not required to create named editions of products, which should be obvious.

Good luck with that claim. She pretty much did a Cook’s Tour of the amplifier showing the things that weren’t good quality and the components that were below spec. She has nothing to worry about on the issue of "libel," not least because her attention was drawn to the device when she was consulted on a remedy for a major failure of one unit which she identified the defect in design and created a solution to fix it, which then Willsenton implemented ("please tell the jury why, if it was OK already, as you say it was".) Willsenton then also improved the quality of the resistors and capacitors, some of which were under spec, and a choke, also under spec. She compared it to a Muzishare amp at the same price point, which is totally fair game for consumer review.

She isn’t offering engineering consulting services, so the point about professional credentials is moot. She is a skilled hobbyist AFAIK.

YT isn’t the only web venue where R8 modders are active, they are on AK, Reddit and probably other places I have not seen. I have seen other mods different from hers on YT as well.