Interesting. I am not enamoured of the SE series ... I find the super-tube to be harsh and clinical sounding. Also, there's no opportunity to tube roll. I spoke to BAT today and they said the 3iX is an upgrade over the 3i IF I go for the BAT-PAK and/or other options ... they very enthusiastic about it in the SE version. I will try to audition a unit, but don't feel in such a rush to change at this point. Thanks for your help.