I have one on both my Camry and my Corolla. I do not have any experience with the DEI xpresskits...but the Idatalink modules work very well, easy to install and super easy to program. My only 2 options at the time were the Idatalink modules or the DEI 556UW, and I didn't want to lose a key, so I opted for the Idatalink...good choice I think.