I was actually very surprised. I mean for just putting it on a window mount and using your phones gyro, its pretty great. Theres like half a second of lag between taking your foot off the gas and the blow off, but i wouldnt really expect any better given the way it works. The only thing I dont like is the volume. I like to listen to music from my phone, and you can barely hear it over the music. You cant even adjust the blow off volume, just the compression, which you cant hear at all even at max volume. If they fixed that it would be perfect.
Fruitsauceonion about iBoost: Turbo Your Car!, v4.0.5