The X-series Xtant amps are pretty awesome and will definately give the Boston amps a run for their money. The B.A. amps are actually made in Italy if I remember right and have been available in Europe for quite some time. B.A. had certain criteria to fill with the amps and found someone who could meet all them. They've never made any amps however they're one of the few speaker companies that makes all the components of the speaker themselves. I heard the new amps a couple months ago in a B.A. demo car and they're amazing. I work for a B.A. vendor (the "eastern enemy of Ultimate Electronics" I guess you could say...not to mention any names
) so I get the inside scoop direct from the source. And if you knew what I'd be paying for my Z6s you'd probably cry.