As someone who prefers silicone protectors to the hard plastic ones, I found this cover to be worth the asking price. While said price may seem rather high, in my opinion, this product really delivers.
First off, the color is not a "solid" black. It's somewhat transparent, though when placed on your system, you won't be able to tell. At least, I can't with my 3DS (Cosmos Black), it may differ with the blue model. The overall build and construction of the protector is pretty good. It's a sturdy, fairly thick silicone. The one area that does seem lacking is the "hinge". They aren't as bulky as I would have preferred, but I don't foresee them breaking from normal wear and tear. If you're someone who is constantly taking the protector on and off, or have a young one who might tug on them, it could pose a problem, though.
Now, let's talk about the fit and how well the cut-outs line-up. Both the top and bottom sections of the protector are held in place by corner tabs, so putting it on is really easy. I was surprised by how snuggly it fit on my 3DS. It really grips and holds in place, which is something I can really appreciate. The cut-outs for the outer cameras line up great. The bottom half has cut-outs for the volume slider, headphone jack, wireless toggle and indicator light, battery/charge indicators, and of course the stylus and game cartridge slots. Again, all line up great.
The L and R buttons are covered by the protector, which I don't particularly care for. This seems to make the buttons somewhat less responsive and means having to push harder to get them to work. I've contemplated just using an Exacto knife and carefully cutting around those buttons, but have yet to do so, as I'm afraid of compromising the snug fit of the protector. My biggest gripe with the protector is the lack of cut-out for the SD card slot. That said, it's not like it's a huge pain to remove the protector to get at it, considering you'll only do so once in a while.
The only other con to the protector is not being able to use the charging cradle. This may be a deal breaker for some, while others (like myself) didn't plan to use the charging cradle anyways. You can still use the charging cradle if you take the bottom half of the cover loose every time you need to charge, but some may consider that a hassle, so take that into consideration before you decide to buy or not.
All in all, I really found this to be a very nice silicone protector. If you are willing to look past the price, I think you'll be pleasantly surprised and quite satisfied with what you get in return.