it's not that cheap for you see there. Think about it. Do those parts really look like they are worth more than say $65. They shoudl sell it for about $180 absolute max. It doesn't look like it takes a lot of weight either. You can get a hand crank sit stand desk on amazon for about the same price. Cheap or nice piece of wood for the top at 25 bucks and you're all set.
When the article's 2nd option is an ugly hack and comes out as over $400, and you probably already have a desk and this works better and looks better... I'd say it was a damn good price.