Be careful with Google voice as your mobile number. Your texts won't be texts but will come in via an app. And it doesn't support MMS. You may not care about receiving photos but MMS is used to send multi-recipient text messages as well.

The net effect is that if anyone, ever tried to send a text message to you and several other people at the same time you will not receive it. You will not receive a notice or anything, it will just silently fail and the sender will assume you are ignore them.