I would add to that list:

- Free same-day standby
- Basically guaranteed window/aisle regardless of check-in time, and even if buying or switching flights last minute, unless short connection. (On a short connection you might get a middle seat, but on the plus side there will probably be room in the overhead, unlike the legacies.)
- Priority check-in line, esp at int'l stations with no kiosks, or if checking bags, or IRROPS.

This is separate from any advantages/disadvantages WN has, though $0 change fees for all fare classes is pretty nice perk of WN in general.

No, it's not going to get you to Paris or Tokyo in J, but it's not a bad program for a mostly domestic airline. Similar to the legacy programs domestically except for the free upgrades, which are pretty rare for the Silver / Gold level or equiv.