Hey scatterbrains, this is Matt G. I believe we have shot together a few times and you have likely seen me shoot off my monfrotto cxpro190 and hog saddle.
I have owned both the aluminum 190 and carbon 190 and an aluminum 055.
Overall for constant carry and use the carbon version is lighter, quieter and more ridgid. The 190 is way smaller for carrying around or strapping to a pack but after all the reviews and camera forum scientific tests it looks like (and I would agree) the carbon 190 dampens vibration and is plenty stable versus the aluminum 055.
FYI I run the 19lb AI AX so you know I put some weight on the tripod. I do have a new version 055 aluminum that is only used for range use but rarely goes out. I take the 190 carbon everywhere....