Well here is a question I can answer with 100% certainty. I had pair of Polk's MOMO's in my truck and I really liked them. I didn't see how anything could get much better but then I took them out for a pair of Image Dynamics and I was VERY impressed. The Id's are much, much, better their is no doubt about it.
I was so impressed by them I bought a pair of IDQ 12's and an ID Q1200.1 amp to push them also. It takes a lot to Impress me but the ID brand has done just that, I am definitely a ID Fan Boy now.