The only time that I have ever been beaten was by a tuned ACR (250+ whp), on slicks, with a driver that had already had 5 years under his belt when I had 1.5. Really hasn't gotten close since, and that same car is usually 2+ seconds behind me, regardless of the track design. (Now a little over 3 years)
I got kicked around by a Buick and a diesel Rabbit when I started though, so the car barely even matters without driving experience.
My experience with driving an SRT was on a test drive when they first came out. I was impressed by the power, but I was expecting that. I came upon a twisty that would hardly even give me trouble in the SVTF, but seemed to seriously confuse the SRT-4. My first thought was honestly, "This thing handles like a milk truck!" Lots of body lean, not much front-end communication. The way it floats around especially would hamper it on course with quick transitions. It simply has a much harder time getting it's balance back before being able to get into the next manouver.
I will use one particular example. Another FFer (Venom713 I believe) came out to our last couple events with an SRT-4 owning buddy who had been saying the same kind of things. 3 days after the second event he told me that same buddy was trading his tuned SRT-4 in on an SVTF. What does that tell you?
The SRT-4 is a good street car, would be a decent open-track car, and is a great car for sport compact drag racing. It simply doesn't compete at the same level as the SVTF on the AutoX course though.