I must say I'm more of a fan of the Spoon N1. yes, it's loud as hell, even on stock piping on my old LS, it was hella deep sounding. The Apex'i is deep with a cat, w/o a cat, it get's kinda buzzy sounding. My friend has a test pipe and the resonator cut out on his 2000 SI, and it now has somewhat of a hollow sound to it, and fuckin' screams when he hits VTEC. You can hear it from a mile away, I swear.
The Spoon has a nicer sound, though, IMO. THose are the only two exhausts I would ever get for any of my cars.