We found that the 20% discount on positive space tickets was only about twice as much as a full fare ticket on Southwest.
We found that the free guest passes for standby were not free, but were about 20% less than a confirmed seat, discounted ("sale") ticket on...ahem...JetBlue.
We also found that my non-rev family members travelling without me stand-by/space-a were treated like gold, seriously, by CSAs and FAs everywhere they went...raving about how nice everyone was to them.
And the ID90 benefits (on other-than-Air Group) kick in at 6 months...so I'll let you know how the SFO-TLV works out on UA.