There wasn't much I disliked about this bike. It handled everything in our area, was fast and stable, but I had two things I would update/upgrade if I was to keep the bike.

1. The DT Swiss 370 freehub body was way too slow for me. The techy climbs in our area require a bit faster engagement to stay on top of the pedals through the rough stuff. Star Ratchet Upgrade
2. The handlebar sweep and rise never felt right to me. I fiddle with it plenty, but I just didn't work for me. The 35 mm bar was also too stiff for my 140 pounds. I would swap this out for a carbon Enve or Renthal bar.

If you're on the cusp between the recommended height range of two sizes, the absolute best thing is to try to ride them both. At a minimum, check the stack/reach measurements on your current bike and compare it to the new model you are looking at to get an idea of a fit you are already comfortable with. If riding the bike is not an option, consider the following.

Body Dimension

Not all bodies at a given height are the same. If you have longer legs and a shorter torso than the average person your height, that may push you towards the smaller of the recommended sizes. If you're all torso and arms, most likely you'll want to size up.