I can tell all the best about old series, Confidence 5 at least. One friend of mine owns a pair and he claims he solved speaker problem forever.
About new series you have to try it yourself. Since I am limited to narrow speakers I gave them a try last november (C4 was too tall for me, so I tested C2 at home). They simply did not fit in (so my quest goes on), but I can confirm those are definitely ugly and awesome sounding speakers (as in my dealers room). Worth giving them a try.