Matt, Matt, Matt... we've been over this a billion and one times: The size of the amplifier really doesn't matter and it isn't a measure of performance or quality. You called out the amp size and little else.
These look like they could be very good on paper. The drivers they have are extremely good and that amplifier/DSP combo is one of the the best out there. The cabinets could be better, but that's already a ton of expense of the drivers and electronics. A perfect enclosure could easily double the selling price while offering only a 20% improvement in sound quality.
However, the proof is in the pudding. Just because the components this guy used are great, that doesn't mean the speakers sound good. They need to be listened to, or I need to see a ton more measurement data on them, before I could tell if they are any good.