I am a huge evangelist of this piece of advice. I'm the founder of a startup that offers ONE price --- and free trial credits, of course --- for each product. I think it has helped us tremendously.
The amount of startups I see that use the 3-column pricing plans (or worse!) is mind-boggling. Perhaps there is empirical evidence supporting complicated pricing. But I've never seen it. I specifically went with one price per product because I think complicated pricing plans negatively affect sales and sign-up rates, not to mention operational complexity!
If you're interested, here's our pricing page: https://siftrics.com/pricing.html