Amazing amp. I have a limited edition ABM Klystron 500 Noir. It kicks some serious ass! Beautiful tone and power. I never get it when people criticise them. I know it's only people's opinions but not only does mine sound awesome to me ears: my band, sound engineers and audiences are always complimenting my tone. This head is also used by the bass players of bands Foo Fighters, Stranglers, Biffy Clyro, Bloc Party, Libertines, Suede, Pink Floyd, Paul McCartney, Buckcherry etc..... Listen to 'Wasting Light' by the Foo Fighters, outstanding tone, all on an ABM. If that's not enough, Ashdown are the best company I've ever dealt with, in any sector.
Enjoy it man, welcome to the family!