I quit riding with a computer about 10 years ago! I never miss it. People will ask me how far I went, how fast, etc. I just tell them far enough and the time that I was out. I gave up being a mileage and speed geek a long time ago. I gauge myself if I can keep up in a peloton with certain people, how long I'm on the bike, by my interval efforts, etc. I used to wear a heart rate monitor when I'm racing or training to race, but not really for my hard efforts as much as when I have to ride slower for recovery (which is so hard to do).