Is Monday.com's impressive growth enough to justify its high valuation? Here's what you need to know.Have you heard of Monday.com (MNDY 0.79%)? Maybe you've run into its software-as-a-service (SaaS) platform at work -- where more than 200,000 client companies use Monday.com to manage their workflows and projects.The stock has been a big winner over the last two years, gaining 125% while the S&P 500 index rose by 37%. That market momentum looks good, but Monday's stock is also soaring to nosebleed-inducing h ...