Adding this DP here but perhaps flying SDC or SDS warrants a separate thread.

Yesterday morning and this morning, I flew same day standby (cheap Basic fare so no SDC) as an ALP. The GA was able to put me in the front row ELR seat 1C (my choice) for both flights. Flights were maybe at 80% full, several front row ELR seats open. No issues with bins as I flew with a backpack for an overnight trip.