I have a spectre that is very similar design. I went with them just out of price difference (under 100 bucks on ebay), and I can always throw a k&n replacement filter on if need to for about 60 bucks. K&N probably has researched their design a bit more, and looks like the air flow wouldnt bounce around as much as mine.
I noticed an immediate improvement, especially with throttle response. I think it is one of the best affordable mods people should do.
My thoughts were to modify it a bit, and run some sort of tubing from my grill into the box to force even more cooler air in, and I had seen many people had success with that same idea. I haven't done that yet, because my hole saw burned up when I started
note, if you have a throttle body spacer, you may want to remove it, or you will be fighting the install for an hour or two.