I just went out of town and noticed that the clock on my Tour didn't automatically change when I changed time zones. I double checked and it IS set to use network time, which was displayed correctly in the Date/Time settings. Originally I thought it may be an OS issue (I'm running .419) but one of the girls I was with also has a Tour with the stock Verizon 4.7 on it (EDIT: ...and was having the same issue).
Prior to getting my 9700 I didn't have that option, and when I would go out of town it was pretty frustrating not to have the right time on my phone. I just spent two weeks in Maui, and when I powered my BB on after landing, the sweet phone asked my permission to change to the local time zone! Awesome!
It's pretty disconcerting though, to look into your calendar and see that the appointments are all based on your home network time. Yikes! A 4:00 am meeting? Hmmm...