I just bought a Mesa MPulse 600 and it is by far the best head unit I have ever owned. It has a solid low end with all kinds of tone shaping controls. I didn't even have to make any adjustments ... I set everything to zero (midpoint) and cranked it up .... it has more headroom and a much tighter sound than any Ampeg, Eden, or SWR I have ever played ... and since it's Mesa it should be a solid workhorse for me for a long time to come. Best Purchase Ever .... well worth the 850 I paid for it!!!