I have to say I'm happy with the Apexi WS.

The finish is top notch and gorgeous. Sound is sweet. As you probably know it's not much louder than stock but has a very nice growl at WOT. I thought it would be a bit deeper but how deep can you really get with a 4-banger? As for power, who really knows without the dyno. All I can say is that it seems to rev a little better in the top end, which probably translates into a little better power. Before, the stock system sounded pretty harsh and forced above 5000rpm but now it revs right up and it sounds like it was meant to be revved that high all day long. Definitely no feeling of torque loss down low like some people have argued.
Now I just have to go wipe the oily smudge marks off the stainless steel...stupid mechanic.