If you guys have a force close issue on 4.3 rooted ROM, there's a way around it. After freshly installing it (delete cache, delete data) and you open the app initially, do NOT enable SMS. Once you're in hangouts, and all signed in, then go into settings and enable it. Works perfectly.
However, this SMS integration is pretty useless. The beauty of the Google voice app is that it truly sends SMS over data only. The hangouts integration needs a cell signal. Easy test to prove this - put the phone in airplane mode and manually enable WiFi only, then send an SMS thru hangouts, it won't work. Thats a big step backwards (at least from my perspective).
Sent from my SPH-L720 using XDA Premium 4 mobile app