Received the Bassforms BF3Series fiberglass enclosure and installed this past weekend. I put an Alpine Type R 12" sub into the enclosure which is pushed by a bridged Rockford Fosgate 400-2. Wanted to go with a Rockford P3, but the flush mounting hole was 12.5" and the diameter of the P3 is 12.75", so no go.
I'm impressed with the construction and the bass this thing produces. Sticks out a little more than I would like, especially with the Rockford Fosgate sub protector I attached, but it's a lot better than my original sub box and affords more usable space. And Industrial Strength Velcro (lots of velcro) is my friend as it keeps the enclosure in place, even under hard braking, acceleration and turning. Originally considered bolting into place, but too much work and potential screw ups.
They honored the $299 price from their website (which went from $199 to $399 in a mater of days). Believe me I tried to get the $199 price.