It's a VERY different head than the LMII... bigger and deeper in the low end, but not as much low mid punch or warmth. It's very, very clean, crisp and hi fi. To be honest I prefer the warmth and punch of both the LMII and the F1 to this head. However, for those who want it big, wide and clean (I call it a 'super iAmp800), it's killer. It does that modern 'Mark King' tone very well. At this point, I prefer it a little more warm and punch in the mids, and tighter down low.
The amazing thing is this amp is about the same weight as the LMII! Pretty cool if you are looking for 'big and transparent and hi fi.