I am running one of the 128GB Titans(replaced a 74GB Raptor), and they definitely do stutter still at times. I am still pretty happy with mine, and it's runs quite well 99% of the time. You will still want to apply some tweaks to get optimal performance out of this drive.

Most of the guys here are running their Titans in RAID with a decent controller, which negates all stuttering on even the 1st-gen Jmicron-based SSDs. Their results are not always going to be indicative of single-drive performance.