Not so great if you want it to actually ring when a call comes in. On the Bold, I found that I have to use the ringer that sounds like an office phone ringer. If I use any others, it plays the short sound once (and they are all only a second or two in length) and I tend to miss the call. Also, I want the Favorites group open every time. Isn't that reasonable? I mean, they're my favorites. But it always mysteriously moves to Frequent or All, so that I have to swipe to find what I want. Most of the tiny icons don't look like what they represent, or two or three look almost the same.
It's crap, and I can't wait until my company replaces it with an iPhone.