this is the second jbl sub i have bought. The 1 st one lasted 5 years before it started sounding bad but still worked. You must remember that it is in a harsh, wet , rough environement. I bought the second 1 because it fit and is a complete unit amp and all. It has been known to play for as much as 10 to 14 Hrs straight on a good hot Sunday.

Very pleased with this product. Would recommend. Good bass sound for the money
Pros: easy install, sub well protected, 3rd year with no issues
Cons: its bass is not as tight as a tune port sub, very deep and wide enclosure, eats up storage space

Subwoofer - MPS1000 - Fairly decent mid range sub - with no enclosure issues. Got mine elsewhere for $199.00 and Free Shipping so who can lose at 2 bills?

Mounts easy and has it's own sealed box. No vibration or rattle. Not sure about the posted power of the amp. Sounds more like 100 watt. Still plenty of base for the boat. Well protected grill.