Whats interesting is that I notice a ton of people on here that just dont seem to think the Q gets loud, or that just because someone wants to get loud they shouldn't buy the Q. I was in the same boat trying to decide my last sub choice. But against what several people said on here I went with the Q and was very happy I did. I went in wanting very clean hard hitting lows and that exactly what the Q does. I was tuned at 29hz and the sub was a monster under 42 or so hz peaking at 30hz (in my truck, my box, etc) Matter of fact on the meter my setup was within 2 decibels from 28hz all the way to 40hz,very flat. If SPL or competing was my main concern the Q would not be my choice. I know someone local with 2 18in BL's and he went from the Q because of similar suggestions and even he said the Q was much better on the lows. I will say that the BL's seem more peaky to me and not the sound I am looking for. Hence why I just ordered two new 18in Q's. And yes I have heard alot of different setups. I have a picky ear and the Q fits my needs. Summary from my experience if like the mainstream rap and want the 40hz range peakier output, or want to bang on your buddy, etc.etc then get the BL. If you are not constantly on full tilt, like a very balanced sub that gets very low with authority then consider a Q. Neither will matter if the enclosure isn't up to par