The only good thing about the Linkyo is the price. It’s so cheap you won’t feel like you’ve been ripped off when you buy it. And I don’t believe the maker of the product is trying to rip off anyone. I think they’re selling a product they think is genuinely good. The packaging seems to convey that message.
But it’s a middle-of-the-road product at best.
The Warthog 2 does a far superior job of sharpening straight edged blades. It gives a sharper edge, and does so more easily than the Linkyo. But if you have some cash to throw away, buy the Linkyo knife sharpener. It might make a good Christmas gift for someone you think might like an intro to knife sharpening.