I have used my new Garmin 220 about 5 times now - I have simply gone for an unspecified run and simply watched what average pace I was doing and at what average HR, I have used it to beep intervals at me, used it to alert me when either pace or HR is too high/too low. Now I can see that I can programme more complex workouts into it - eg do a 10 minute warmup at a specified range of pace thna do a specified time running at a range of HR numbers, that the same thing at a range of pace, then a cooldown at a certaing pace - etc etc. - Haven't actually tried out the later yet but I assume it will beep and tell me when to start the warmup and runs etc and sound alerts if/when I go over/under the certain paces and HR numbers.
Anyway - over to you more experienced Garmin users - how do you regularly use yours?????