I was informed on my 04 that it's not a recall, just that there's a TSB issued for it.
I just did the repair that GM says to do, and found it to be quite easy. The sensors are a pain to pull completely out, they come about half way and then got stuck and I had to gently use a pair of pliers to get a firm grip and get them the rest of the way out. I can see where some people have had them break off.
Then it was just a good sanding job and some grease and put it back together.
For what was supposed to be a quick repair, it was. And other than the fact once I had the rotors off I discovered I needed new rotors, it was free to fix.
Took my under an hour to do the actual sensor fix...the hardest part was loosening the bolts on my brakes, they were pretty tight. After doing the fix, I havent encountered the issue that I was, so I recommend attempting the fix yourself if you're even remotely mechanically inclined, as I found it very simple and self explanatory.