They inherit all the limitations of DO. For example, if you want to do anything that requires more than 6 TCP connection. Every fetch request will start failing silently because there is no more TCP connection to go through. This was a deal breaker for us. Their solution was split our code into more workflows or DOs.

You are limited to 128 MB ram which means everything has to be steamed. You will rewrite your code around this because many node libraries don't have streaming alternatives for things that spike memory usage.

The observability tab was buggy. Lifecycle chart is hard to understand for knowing when things will evict. Lot of small hidden limitations. Rate limits are very low for any mid scale application. Full Node compatibility is not there yet (work in progress) so needed to change some modules.

Overall, a gigantic waste of time unless you are doing something small scale. Just go with restate/upstash + lambdas/cloud run if you want simpler experience that scales in serverless manner