Compact, lightweight, maybe a little to lightweight?

Received this product 3 days ago. I've used it on a few knives but not many (approx 7). I was able to sharpen both straight blades and serrated. The 1st knife I sharpened was a cheap one, low quality metal straight or flat blade. This was my practice, surprisingly the product did a pretty good job. According to the instructions you can sharpen single beveled, double beveled blades, and serrated blades.

The product is quite light. I question the longevity of this product because it feels.. well cheap. Maybe if there was a was to anchor it I wouldn't be as hesitant. Let's be real, I'm sharpening knives .I don't want to think it's going to slip (even w me holding it).

Overall it's a decent product. The instructions are detailed and easy to understand. It did perform as expected. However I wouldn't pay more than 15$ for it.