I use my just as a voice mail service. I love it. I HATE voice mail, so having them transcribed and sent as a SMS is just awesome. Even when the transcription is borked (which is as often as not) I at least can listen to it on my PC and in the order I want. I can skip the ones that I already know the content of (e.g. when they call again and get through).
This is probably true for "visual voice mail" in general, but like the DVR I consider this a must have modern convenience.
I too setup my google voice last week. I used to have youmail and I was paying $6.99 a month for 50 transcribed voicemails per month. Although google is free, it's transcribing capabilities are far worse than youmail.