Coming from a Zumo550 and 8500x50 I think the IQ is a pretty decent attempt at a step in the right direction towards unifying the GPS and Radar. The radar functionality certainly sounds pretty good. Passive Laser detection is a fallacy, it only serves to inform you that you're about to receive a ticket (a little before you hear the cop's siren), the only real Laser protection with a Laser Jammer, e.g. Blinder or similar.
Biggest issues for me would be:
1. it's ain't waterproof
2. i'd need a separate mp3 player, instead of a separate radar detector
3. does not have the Mapsource route building support
For cage applications the IQ certainly sounds like an awesome all encompassing product.