He was always very consistent. If he were choosing his career highlights, I'm sure he'd point to being the champion in Munich three times and Kitzbuhel twice, both "hometown" tournaments for him. Also, beating Djokovic at 2009 RG and 2019 Indian Wells. He also made the quarterfinals of Wimbledon and was a champion in Halle.
I remember he ended up having to play John Isner in the third round of the US Open three years in a row, and he won all three matches.
He wasn't flashy, but his game was always pleasant to watch. A career to be proud of for sure.