Well, I just finished a 4 mile run in 33:38, using my Nike+Sportswatch. Maura (Santa) got it for me for Christmas and I love it. The GPS in it is accurate and gives me pace, time, and distance easily. It also has a stopwatch I can use at work all the time and an alarm. If you are thinking about it, Santa got mine at Road Runner Sports online and searched for a coupon code to use. It was down to about $125 final cost.
As far as the run, I was tired. I am not used to training 5-7 days a week again yet. Although the recovery day yesterday was good and I have no real aches or pains today, I am tired overall. I may scrap the second workout I had planned for this afternoon. I have to wait and see. I do have the benefit of a good block of time tomorrow to get in a great workout so I may rest and get some good calories the rest of today.