I've obviously backed the gain off on the amp, and only added subtle gain on the pedal, but it gives me the same level of heavy as before but the clarity of notes has improved, and it has a tighter sound. We use a ton of gain so it's important it's not all muddy like some amps can get!
The clarity thing seems to be related to the EQ'ing of the pedal, makes the lower notes stand out better, bit brighter, so I can hear them more clearly with earplugs on, which is improving my accuracy when playing with the band
Our other guitarist tried it into his blackstar tube head and was impressed too, doesn't add mud like the OCD we tried did, really dig the note definition you get with it.
I was surreptitiously pushing it on people at the gearfest, and at band practice, and I might have mentioned it a couple of times on here 
