Free supports one viewer, SD quality with a watermark, and 40 minutes per day. Pro unlocks 3 viewers, HD without watermark, unlimited duration and room passwords; Premium adds 5 viewers, 4K source quality, recording and custom branding.
A room link works for the duration of that session. The moment you stop sharing it goes dead — nobody can see anything through an old link.
Latency depends on both networks and devices. Direct peer-to-peer connections are usually responsive enough to follow the cursor; relayed connections can add some delay while prioritizing continuity.