I have owned the 10" BL and a 15" (the 15" for a VERY short time) both will handle more than 1000 watts bone stock with no options if your smart about it.
Both sounded great to me, I fed my BL 10" around 1500 rms, it was very loud for a single 10" set up.
I ran the 15" BL off my Kx2500.1 at 2 ohms with the gain set low, it sounded good and was VERY loud.
I would say ALL of Fi's subs are worth the money, the customer service from Fi is worth the money, great subs, do not hesitate to buy //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif