*Beware: amp gets hot* But in general, I can't complain. I've been mostly taking it easy on the subs and amp so far. Mounted in the trunk of my 2001 Toyota Camry. It powerfully rounds out the sound upgrades I've already made (kicker 6.5" in doors and 6x9s in rear deck). I do listen to EDM, and this sub puts out a muddier sound than I like. But it's my first dual 10" setup, so I'm happy with the increase in power in the lows.
On my maiden voyage, I drove for about 40 minutes and played bass-heavy music to start breaking in the factory-stiff woofer components. The amp was set to 1/4 gain, +4 to +6 bass boost, and probably 100Hz LPF. The head unit was set at a bit below 1/2 volume (a bit above 2/3 volume is too loud to hear a passenger yelling at you). The sub only slightly shook my rear-view mirror. When I got back home, the amp was fairly hot. I haven't tested longer play times yet, but I anticipate that when I turn the amp up to what the manufacturer recommends (1/2 gain, +9 db bass boost), the amp will probably get really hot. Especially since it's in the trunk.
Since the maiden voyage, I've broken in the components a bit more, and I turned the gain up to 3/8, and upped the LPF to include higher frequencies to help my 6x9s keep up at higher volumes. About two weeks later, the subs are really starting to round out and sound strong.
In another week or so, I'll max the settings to 1/2 gain and probably +6 db bass boost. I expect some strong bass then.
Pros: Hits pretty hard on moderate settings (after breaking it in).
Not a power hog.
Cons: Amp seems relatively cheap. No phase switch on amp. (However, I can work-around this by setting the LPF on my HU - then a phase switch appears). This is significant because the sub seems to hit slightly after the beat. Only noticeable on kick-drum solos, where my mids hit sooner than my sub (read: I hear my sub after my mids).
Amp gets hot fairly quick.
No way to change "level" setting remotely (i.e. corded dial that plugs into amp)