The Spectre is kinda cool, but it really doesn't seem like a full concept. It's a little like they wanted to remake the Maverick but not replace it (I assume it still sells well?), so they gave it a really uninspired barrel and a modular stock to pass it off as not-a-pistol. Yet, it just looks like a pistol with a bonus accessory pack.
That said, though, it is a nice looking pistol and the stock, as flimsy as it looks, should look spiffy on any of the modular-stock guns.
I want the shotgun, but I doubt I'd ever use it if I actually had a Nerf war with someone. It's too bulky and the reload process is too long, but looks like fun for shooting at random stuff in my bedroom.