SRP has an "estimate my bill" feature if you have one of their smart meters installed. Based on about 10 days worth of data for August, my bill is estimated to be $130. That includes a $27 voluntary "Earthwise Energy" surcharge(which helps me imagine that my power is coming from renewable sources and helps fund SRP's "green" initiatives).
Take out the Earthwise money and I'm looking at an August bill of about $100! My July bill was $185(with the Earthwise surcharge and 1 week of EZ-3).
The most difficult aspect of EZ-3 is keeping the A.C. off from 3pm to 6pm. My house's envelope is efficient enough that the indoor temp only rises about 3-4 degrees during that time - depending on outside conditions. That's not so bad if you crank up the ceiling fans.
Conclusion: EZ-3 will most likely save me a boat load of money vs. Time-Of-Use (30%?). I'll update again once the actual bill is calculated in early September.