Since I changed my tire size I have an alignment date for Friday. I did offset bushings last year and wasn't impressed with the alignment and couldn't remember if I had them right. Took both UCA's out and checked last night. All is correct.
The offset bushings are pretty much only good for adding a couple degrees of caster. While some people have had success getting as much at +4° of caster with them, you have to remember that alignment settings are also ride height and front/rear rake dependent. And of course, factory tolerances. It's more common to only be able to get into the +3° range with the offset UCA bushings.
Depending on the use of the car that can be fine, for a street cruiser with 215's or 225's up front that's enough to keep things returning to center. However, if you're running wide tires up front, say, 245+, you'll likely need more than that to tame the wide front tires. But at that point you probably want tubular UCA's anyway.