These are on my MKV build. I am building the car for track and fun weekend use (almost finished). Exposed spherical joints certainly won't do well for daily drivers that don't live in fair weather states. (I live in SoCal).
For this build NVH was not a consideration, only max performance and max responsiveness. I used these as well as 034 rear control arms and trailing arms that also use spherical joints along with 034 Billet.
Added benefit was weight savings over the stamped steel arms 9 vs 5lb..
Build is nearing completion so I will be able to review soon if I am not rattled to death by this thing...... all the sphericals, all XB frame stiffners, stiff 034 billet motor/trans mounts and balance shafts removed from motor (going for 8K rpm redline).