Try it. I'm liking it. We use basically the same amp, and I'm not hearing "darker." I'm getting more punch in the low end using the Dunus. Fills up the sound, but it's certainly not overpowering it or making it muddy. Treble is still fine (I tried Taxman by the Beatles, my go-to for "almost too bright," and it is still right on the edge. Stuff by Buffalo Springfield, which is a bit thin, gained a slight bit of "deeper," while stuff by George Michael, which is already plenty deep, gained more punch in the area of kick drum. Vocals are fine, mids are fine. I think 7S Cameron got it right, above, when he said the bass is improved. I tried one of the earlier custom firmwares, which I found both too bass-y and too shrill. This is neither. If you were willing to try the "sound explosion," even though you reverted back to 1.2.8, you REALLY should try the 1.5. C'mon, you've never led ME astray, I'm just returning the favor.
*quoted from 5 pages back*
Damn this thread moved fast. I'll give it try mate, I actually went back to sound explosion today and very much enjoy it with a range of IEM. I'm just flat out atm organising some things.