I´m still working on getting a killer tone recording with it, i have only had it for a couple of weeks and it´s a really advanced amp with more voicing options than on any other amp i have tried.
But i´m already convinced that it is an awesome amp for recording, i´ll post some clips when i´m satisfied with the tone, after all this is the Andy Sneap forum, you just can´t post a half decent tone here, besides it´s my favorite amp and i want to do it justice.
I tested the el 34 version for several hours next to a Bogner ecstasy, a Bogner Uberschall, an Engl Invader, Madison Divinity,Randall v2,Rivera Knucklehead(these were the amps they had availeble at the local music store, and yes i know they are all cheaper than the e670 and the ecstasy)
At first all of them sounded really good , but after tweaking for an hour there were only the Engl e670 and the Ecstasy classic left in the competition, both have really fat and heavy rythm channels (the Engl have far more gain), beautyfully sounding clean channels and some of the best solo channels i have ever heard(in my opinion the Ecstasy had the best lead channel, but the again i´m more of a rythm player).
The Ecstasy was heavy as fuck and at the same time the tightest amp i have ever played, but it lacked a little gain for the style i like to play.
The E670 sounded just as good or maybe even alittle better for my way of playing, and it beats every other amp availeble when it comes to ekstre features and midi capabilitys(take a look at the rear, it even has an ekstre clean channel and a cabletester)Both amps have a very detailed thick distortion full of harmonics and after playing them for a while it´s quite obious that there´s no going back to playing cheaper amps(in this price range you really get what you pay for)
some clips from Derek from rocksolodamps
http://www.musicv2.com/artist/rocksolidamps
Here are some samples from a guy on the Engl forum
http://www.soundclick.com/bands/pagemusic.cfm?bandID=406888
from rocksolidamps.com:
http://rocksolidamps.com/index.php?contain=description&ii=8&mid=2