This article is nearly 10 years old. Is this still true?
In the US, during a period of insane stock price appreciation, yes.
People who joined in Dec 2022 got massively screwed though, so it's not really reliable cash.
The employer gets labor at a lower price, and the employee gets lower volatility.
If you want the best price, you have to do the work to keep buying and you have to do the work to keep selling, only way any market can work.
The former is not controllable from the perspective of a labor seller, but the latter is. Whether or not the tradeoff is worth it is dependent on the seller and always in flux.
I would say the tradeoff is usually not worth it.