How good are these "scandoublers"?

[davidmarshall15]

I was planning on getting an internal scandoubler, but I recently opted for the cheaper option of getting one of these https://www.amazon.co.uk/gp/product/B00RMMGOGS

Decided on this after watching this youtube video https://youtu.be/df0R3gQavrY

I have to say, for the £17 I paid, it does an excellent job running an interlaced desktop on a modern cheap LED tv.

Very happy with it.