Do you find you have problems with MMS and Google Voice? Last I checked, it was unsupported and text messages with pictures or video just went to /dev/null without any notifications to either party. That was a no-go for me.
What's frustrating though is the inability of Google Voice to receive SMS from short codes. Craigslist and Paypal also don't verify accounts with a Google Voice number.
http://googlevoiceblog.blogspot.com/2011/10/first-steps-towa...
When I get MMS from AT&T or Verizon, then I don't get anything but from Sprint customers, I get the notification and its in my gmail account right away. Probably due to the integration with Sprint and Google Voice. http://www.google.com/googlevoice/sprint/.