Krell Trio 300 vs. Krell Trio 300 XD

I just bought a pre-loved Krell Trio 300 and overall, I love the amp. Powerful, drives ML ESLs like a boss, and the only class A that will not burn down your house (cool to the touch). However, little bright and too “rocky”.  The more I read about the XD version of this amp it sounds like Krell tuned all these little kinks out and made it more musical. It would cost me 5K, to trade in my Trio 300 for new Trio 300 XD.

Does anyone here have experience with these amps, can anyone tell me if the XD improvement justifies extra 5k?