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This is a great combo at a great price. Please realize that because this woofer is prewired at 2ohms, the amp will only put out 900w RMS. This is good for two reasons: 1) The woofer (according to the manual) handles up to 750w RMS. Realistically 900w RMS is likely closer to the maximum load. 2) Running the amplifier at a 2ohm load (rather than the lowest-possible 1ohm) the THD (or Total Harmonic Distortion) will be lower. This means that the output from the amp will be cleaner and less distorted.
The woofer box itself is very sturdy and well-built. It has a SINGLE 2ohm terminal, for easy wiring installation. The box comes with mounting brackets and screws to brace the box to the surface it will be sitting on (e.g. the floor of your trunk). The box also features a flared port, which really does cut down on wind-noise.
The sub will slam hard and will not disappoint. If you are disappointed with the performance of either the sub or the amp there is a 99% chance you installed it wrong. The other 1% chance is that it arrived broken.