I've been thrilled with my xp-7/HD600 combination. Got it about 3 weeks ago and listen for about an hour or two a night. Still on the first set of 9V's.....that Todd sent in the unit! I also didn't spring for the dedicated power brick but likely will in the future. It's reported to give you 98% of what the HR-2 does AND you get the portability. IMO, that's a great combination. As for the batteries being "rechargable", I don't see it as an issue. It's not as if you were getting 10-12 hours out of the 9V's here. I've seen reports of 30-40 hours of use from a set in the XP-7. If you're on the road, can't see picking up a pair as being a real problem and having a couple of sets of rechargables at home will keep power on hand at all times.
Now as for "portability", I guess it's a matter of your own definition. In my case, that means moving to different rooms and not so much a matter of taking it on the road. I like the fact that I can easily move from the entertainment room to the bedroom without unplugging and unthreading power cords. Even adding the power source won't change that option. Simply unplug and your portable with long lasting battery power. How good can it get?
Now for the sound. I'm not a "novice" but have been out of the loop for quite a few years when it comes to audio. School, family and career have had my full attention but I've recently come back around to a forgotten love so my opinions should be taken with that in mind. Personally, I don't like a real bright sound(the Grover SR IC's brightened things up just right though!). Love jazz, the blues, rock and at times, classical so I needed a head rig which was capable of handling it all. The XP-7/HD600 combo has been a joy and won't disappoint! The XP-7 is an incredible amp!
