We hit Ellensburg twice this weekend, once on Friday eastbound, and then on Saturday evening heading back home. At about 12:15pm on Friday there were two spots available when we arrived, and things were okay. On the return on Saturday though all stalls were full and the two cars on the end stalls (don't have the numbers) were saying that neither one was working. We ended up eating dinner at the Palace and charging there for an hour or so, enough to get home.
I cannot wait for the expansion here, as five stalls leaves no margin for maintenance issues.