I have had aluminum and carbon stems from multiple brands. I honestly canï¿½t say I notice a difference other than that carbon looks like..., carbon. This is a good stem, looks fast, and has that name brand behind it!
Upgraded the cockpit on my Parlee Z5 with Enve stem and Enve seatpost. (previously using aluminum Syntace and Thompson, respectively). Night and day difference, so much more comfortable. Now I have seamlessly blended Enve SES 3.4 wheelset, with Enve fork and Enve cockpit. Really solid, legit handling! Bravo Enve - you guys are dope!
Replaced my S-Works SL stem 100mm with the 90mm from Enve. I rode a few times, 50 miles and had no issue with the vibration effects (arms feel ok post ride). The cockpit seems to be stable on roughs and descent. I will participate in an event this week which will go over a century, will see.