No issues at all for me. The only thing I've had is one woofer start to fail, which I replaced with another one off ebay.
There is no question that JL, Polk, and any number of other brands have better equipment available. IMO it's a matter of how much one wants to pay for another x% of sound quality. Every person has to make that decision for themselves based on how they use their boat, their budget, etc. I've always believed that an open boat is one of the worst acoustical chambers ever invented by mankind, therefore not something I'm interested in dumping another $2K into.
If I were contemplating this upgrade and was on a budget, what I would do is go with a good quality amp of your choice, keep the XMD3 (you can always upgrade that later if you feel it's needed), and swap out the stock speakers for Polk db651's. The speaker swap would be ~$100 and require no fiberglass work, plus the amp and sub, and I think you'd be very happy with the results. But then, I'm pretty happy with the stock upgraded setup, so take my opinion based on that.
Yes, the sub location is just in front of the sink, below and a bit aft of the shifter. Someone here added a sub in that same location and posted some pics of cutting the hole, maybe you can find that or they can post it again.
Cincy can tell you all about routing the cables for the amp, since he added a 2nd one to his 250/260 which is the same boat as far as all this is concerned.
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