I was undecided as well but then I looked on here and a few people raved about the Injen so I went for it.
I've had induction kits on my cars in the passed and I've always been doubtfull about the performance of them but there is no doubt in my mind the Injen is a fantastic bit of kit.
The throttle picks up quicker and the noise is amazing. Vtec sounded good before but it sounds menacing/insane now.
I'm at pleb level when it comes to working on cars but fitting was a doddle. I haven't had the AEM on my car so I can't make any comparisons but the Injen is definately worth the money. If it was just about the noise it would be worth the money but then there's the good performance increase as well.
visit the rsx forums...they have a list of dynos for AEM and injen to see for yourself that injen gives a bit more hp that AEM in all test performed with a stock car, the torque figures are about the same....am a bit reluctant getting an injen for the fact you have to relocate your windshield washer tank