The thing to watch out for is: deployments. How many units are they pushing and to who. What kind of tasks can those robots accomplish well enough to warrant actually using them. How hard is it to adapt those robots to deployments. How that changes over time.
The hardest problem of creating a universal robot is, and always has been, AI. If Figure can deliver sharp, highly adaptive, easy to use AI? High generalization, good performance on a diverse range of tasks and in many environments out of the box? Then they have a killer product.
And a proxy to track that is reports of how many robots they deploy and to who. If they start shipping to small companies and deploying to high uncertainty spatially complex fields like construction or maintenance? If you start seeing robots unloading trucks and restocking shelves at a small town Walmart, unannounced? Big.