I'm stuck in the LS base radio camp and couldn't agree more with the comments thus far.
After receiving the same song and dance from my dealership saying that they can't duplicate my issues, I've spent weeks researching ways to get rid of my crappy radio... and thus far, I'm stuck with it.
To upgrade from my IO3 to the IO5 or IO6 system would cost thousands AND I've been told that they'd have to remove the entire dashboard to do so!
To upgrade to an aftermarket radio would mean that I loose my factor installed back-up cam and other factory options, which I don't want to do. So... I'm stuck until someone figures out a cost effective way to upgrade, or until a company develops a way to easily convert all of the factory related options to properly work on an aftermarket radio.
Other than the technology/radio issues, I LOVE my Tahoe, but with my options thus far, it only makes financial sense to sell my Tahoe and buy something that has a proper radio system.