Don Pablos is a little downscale as compared to Abuelos or El Fenix. They weren't bad, but they didn't survive in Texas.
Just thought I'd point out that Abuelos is a chain- a very good one, with locations outside of AZ.
Welcome to Abuelo's
I've been to the ones here in the D/FW Metroplex a few times and found them to be quite nice, if a tad expensive.
Then again, I live in a state where you can't swing a dead cow without someone making it into fajitas.