I fly for a company with 25, 35 and 55s. I'm 6'2" with slightly longer legs than my torso is tall. The 35 is doable but not comfortable. I have enough head room, but not enough leg room. After a three leg day or one 4hr flight, my knees and back hurt the rest of the day.

The 25 sucks after 10 minutes.

Now the 55s we fly have plenty of space in the cockpit.