Are you disappointed in the sound quality of XM Sirius?

I recently purchased a year subscription to XM Sirius after cancelling my previous service about 6 months ago. The receiver is a stock Nissan unit and stock Bose Infiniti system. I'm not sure if things have changed in 6 months time, but I've noticed quite a bit of compression that impacts the sound quality.

Notice the 's' and 't' sounds in the dj's voice when talking. It's missing quite a bit of high frequencies. It reminds me of low bit-rate 128k mp3's.

Does anyone else notice this as well? Is XM trying to cram more stations into their bandwidth at a cost of sound quality?