well it's like this: after living with the sonics for a while and testing against the thiel 1.6, i can honestly say that i believe the thiel 1.6 are way over rated. the sonics beat them in every way possible, and the used price was very similar at around 2k each. i'm very happy with the amerigo.
there's alot more air in the music, everything is just more effortless and bigger, wider and more realistic. they're easier to drive as well. i dunno, there's not much point in making a comparison, everything is just better. the thiels seemed a bit flat and two dimensional compared with the amerigo. admittedly, the thiels are a two-way speaker and the amerigo are three-way. a fair comparison would have been amerigo vs thiel 2.4, but i don't have a pair of them. =)