Pros: Good sound
The Infinity Perfect is a very highly regarded subwoofer. It's very nice looking, and sounds excellent. I have a JBL 600.1 hooked up to it, giving it 300 watts, and it has nice tight bass, and gets extremely low also. I've been into car audio for about 2 years, and this sub is in my 2nd setup in my car, and well worth it. These subs will take 500-600 watts easy, I plan on getting another Perfect and a JBL 1200.1, so each sub will get 600 watts each.
OK, on to the specs.
This sub is great, has nice gold 5 way binding posts, and 4 ohm resistance. Single voice coil too, so keep that in mind when you want to match this baby up to an amplifier.
RMS wattage is 350 but peak is 1400, so DO NOT BE AFRAID to give it more than 350 watts.
Enclosure design is important. I have sealed for the best sound quality, and the Perfect does that very nicely. Beats all my friends systems hands down. Right now my box size is .88 cuft, but Infinity recommends 1.0 cuft sealed. Mine sounds good, but for the low notes, my smaller box size limits the excursion of the Perfect, so it can't get ultra low, but it does it close enough.
I don't really know what else to say, other than if your looking for a top-class woofer, this is it. Best of both worlds, killer SQ and mad SPL.