Yes, I did listen to the 2.5.
Honestly, I have never really enjoyed the sound signature of the ASG2 and ASG2.5 is like the ASG2 with the bass tamed down and mids pushed slightly more forward. It still has recessed mids to me. I'd imagine the bass is still big enough to give me a headache over extended listening though, even at lowest setting. Smooth treble though. I didn't spend too much time with it so I can only say that much.
The ASG1+, however really is like a ASG that went through a much more neutral tuning. It really is just like the Rockets with a higher level of clarity and maintains the ever awesome vocals. The treble is as how Aurisonics describe it, really articulate, with slightly more sparkle than the smooth treble of the Rockets. And the bass, let's just say it really should be the bass amount that Rockets should have.
You'd realise I compared the ASG1+ to the Rockets rather than ASG2.5 because it really is the Rockets; upsized. Everything is just better!
P.S. I'm still pretty new to writing impressions. Hope it sounded coherent!