I have no experience with it. Definitely looks to be a step for the brand though. You're paying a lot for the DSP feature, at least at the price for it on
Crutchfield. I Thought this was going into a boat? Not sure how much DSP is going to benefit you with that environment mind.
As for running woofers above their rated power, that is a little more complex.
Ratings are just a guid, to keep most people in check. The Focal 33v2's I run are conservatively rated at 400 watts but I'm sure they will take more, depending a number factors, Are you talking RMS, Burp, sustained high output, these are all different applications that would fall into that "can handle more" than rated category depending on the product and what you are feeding them. It takes power to get over some things that rob power such as box rise and other mitigating factors. It's always important to use the RMS as your guide, pushing drivers for extended periods of time will usually damage your drivers. I am running a 3k Hooligan at 4 ohms instead of .5 (at which it can burp at something like 6000 watts) but at 4 is only pushing 1500 watts to 2 subs that are rated at 800 between the two. I'm not an spl guy. I like that the amp is extremely efficient and has much better damping at 4 ohms, most all amplifiers will perform better at 4 than at .5 or 1 ohm. People think, why waste all that power? As you have mentioned, some of the deals here are pretty good. I buy refurbished or from reputable high rated sellers, rarely have an issue with the products I buy. I have a general rule and not everyone follows it, but if you can afford it, most agree that it's better to have too much power as opposed to trying to make your system strain to get you just to the RMS level the subs are rated for. So my gains are set very conservatively and I never get close to how loud it could go anyway. It doesn't strain the electricals nearly as much this way either. As a rule, i always want my sub amplifiers to be rated 50% to double the rated RMS of the subs I'm going to use.
It's kind of like a wench. If you're pulling a boat out of the water and it weighs a 1000 pounds, a 1000 pound rated wench will get the job done, but if you had one that pulled 2000 pounds, and you knew how to operate it, easy choice if one can afford either.