Good build quality as expected from better Shimano groups.
Nice use of some Dura-Ace technology.
Wide gear range available: 11-32.

Some cautions:

• Non-standard chain rings
• Fussy front derailer
  Cable alignment tool may not report the optimal position with the cable near the center line.
• Rollers of the brake calipers will require more frequent and more thorough maintenance.
• Cables will get fuzzy

Recommend reading at least the lever and front derailer manuals.