On my Android and WinMo phone I used phone weaver lots of choices profile set by time and location I could do just about anything I could think of. I spent hours setting it up then changing every little setting. Its been a while sense I had a BB but it seams like it had a day and night setting as well. Using my WP I don't hassle with a bunch of settings. This way is much more simple. I have the ringer on during the day then at night or during a meeting I just turn it off, simple no hassling with a bunch if settings then worries if I set it up correctly. I really like the fact that the alarm sounds even with the ringer turned off. No other OS does that. For me the great thing about the profiles in WP is its simplicity.