I got my HA-2 to pair with my PM-3s about a week ago. I use it nightly in the neighborhood when walking the dogs, and some for couch-listening w/ my laptop.
I love it! The form factor is awesome, it definitely sounds great, I love all the included cables and of course it's very Apple friendly (which I'm heavy up with).
I "should" be done...just be happy with what I have...and enjoy my listening. But there are two things that keep swirling around in my head:
(1) I'm so curious what it sounds like compared to the Chord Mojo. From what I've read, the Mojo is just such a musical/fun addition that really fills out the bottom end. It feels like most people would think the Mojo is an improvement over the HA-2...but maybe not a "double the price" improvement? I'd be really curious to hear from people who have auditioned both what differences I might hear. What would be awesome to find out is "you honestly won't notice much of a difference between the two...and certainly not a $300 difference." But until my own two ears would ever get that chance, I'll always be wondering.
(2) I actually like the sound of the HA-2 with the bass boost on. It feels like it really helps out the songs that aren't as high quality, whereas the stuff I buy on HDTracks don't really need it. However, this may be me, but for some reason I can't get myself "comfortable" with leaving it on too much. It's a weird psychological thing --- like if I have it switched it on, then I feel it's cheating or not as nice as other options (item #1 above) or something. Is that just a weird OCD thing for me in particular? I don't know why, but I just feel like I'd enjoy it more if I didn't have to engage bass boost. Maybe I'm anti-EQ? WHAT IS WRONG WITH ME?!?!?!