I have some updated info for the followers of this conversation. My experts in real-world deployments tell me that the AP122 is more than suitable for up to 20 concurrent clients all streaming standard definition (standard bitrate, 480p) video such as Netflix, Youtube, etc. on mobile devices, typically at 20MHz channel width, or 10 at 720p. The AP122 could handle twice that many concurrently connected clients if they are doing general web browsing or similar intermittent-activity operations while still providing excellent user experience. See https://support.google.com/youtube/answer/1722171?hl=en for Google’s encoding and bitrate info used as a baseline.
The AP130 fits well where applications are typically HD video or there is a need for wider channels (40MHz or 80MHz), with comparable concurrently-connected client counts.