I have never had any issues. When I call people, I get them and can talk as long as I want. When I text people, they get my message. I receive calls and texts regularly and never hear, "hey, why didn't you reply to my voicemail / text". So I assume it works.

The only problem I have is that I get two Android notifications for each text. One from the SMS app, and one from Google Voice. Not sure how to fix that.

I've used them as a proxy/redirect to my other lines, and generally I don't like the sound quality to my cellphone. SMS works well enough, at least within the limitations of the SMS system.

If my cellphone wasn't already the one number to reach me at, then I'd be more interested.

I haven't used the number porting feature, but I'm using everything else and have no complaints about it. I even got it to replace the features of my android (e.g. replace the default voicemail app with google voice's voicemail).

every once in a while I'll get a call that doesn't ring my phone, but overall I'm very satisfied with the service