I am contemplating upgrading my GS Solo which I got in 2006. I can send it in for a factory upgrade to the SRGII (or wait a bit until the Ultra-Linear model is available). OTOH I am also intrigued by the Concerto (hoping it sounds nothing like the Headfive that I so hated and sold).
I am really happy with my current Solo (have had it for 4 years now) but I'm also curious how much better (or different) the current Solo is and how it compares to its Meier counterpart. For one, I find mine a really neutral and transparent amp with plenty of headroom to spare. I use it a lot with the power-hungry K340 and, though there are undoubtedly more powerful amps (i.e. balanced), the Solo pulls through very admirably. Do the new Solo and Meier Concerto have even more driving power or just more-or-less the same? What other sonic differences can I expect (in a nutshell or in detail)?
Thanks in advance!