I bought a pair when Infinity released them (in black), have a second pair (also in black) in my home now. I do have to say, I never really heard them for what they are until I hooked a large Krell KSA amp up to them. You will occasionally read "they are easier to drive than the older series", that is just not the case if you want to hear them at their peak. The lower end really needs an amp that doubles it's output down to 1 ohm, just like the original 9 Kappa. It also tells you this in the owners manual. This is not to say you can't get good sounds from them with less. Just know they are capable of more.
For mine, I would like to eventually get a powerful tube amp for the top end.