The biggest downside is that it is browser-based. If you want to watch on a Smart TV, a Roku, or a mobile app, you are out of luck unless you are clever enough to cast your browser tab to your TV (which can sometimes introduce audio sync issues). You and your friends must be watching on a laptop or desktop.
"The international travel feature is a lifesaver. I was in Japan for two weeks and TVSpurge.io rebuilt my entire watchlist to show what was available on Japanese Netflix. Seamless." — tvsplurge.io