The XF-R has a navigation system that took us close to three days to become comfortable with. And even then, it was never a pleasure to use. It couldn't find certain addresses, told us to turn down dead-end streets, and took far too long to re-route itself. We wished it worked as good as it looked. What did work well was the standard (but optional on regular XFs) Bowers & Wilkins 440W surround sound system with 13 speakers and a sub-woofer. This thing knocked. Hard. Songs played off our iPod, connected through a 3.5" aux cord, sounded full and lively. Bass-heavy tracks were reproduced well. Even if you opt for the XF, this sound system is a must.