I ordered these over the phone & was kind of skeptical because I couldn't hear them before I bought them. It was the best decision I ever made... I've been DJing for 5 years and setting up sound systems for 10, these portable subs are club quality and I can assure you that there is nothing better on the market. Not only are they powerful, but they're deep & rich; they hit low frequencies that I didn't even know existed in some songs! Couple all that with ability to flexpay and this is one of my smartest purchases ever.
Make sure you power them properly (I use a Crown Xti 6002) and I guarantee you'll have the best bass you've ever heard.