Pass Labs Amp X350.5 or X350.8 anyone compare?

I've had the Pass X350.8 plugged in now for about 5 days. Playing time is about 10-15 hours.
The sound stage is deep but seems a little dark. That is, with little air around the instruments, and the treble seems to be a little muted.
Though this somewhat concerns me, it is probably normal for the amount of time on the Amp.

This was my experience as well. The large PS caps need more time to form. Keep your chin up for at least 40-50 hours of signal.

Thanks for that, Ozzy. Keep up the good work!

Just an update on the X350.8. I have about 70 hours of actual playing time and it has been plugged/turned on for many days 24/7. I'm really not sure how many hours it will take to reach optimum, but to me it seems like it is there.

The Amp is much different than the X350.5. The soundstage is much deeper with a darker (more Analog?) presentation.
Has anyone else purchased the new .8 series Amps?

Interesting...my understanding is that the .8 amps are supposed to have *more* life in the upper frequencies. Anyway, keep up the good work Ozzy!