We got Ooma back in May, and it has already paid for itself. The call quality is mostly the same as before, but there are a couple of small glitches. When someone calls, I often find myself saying "hello" a few times before they hear me, so there is a slight delay. I also notice that during the course of the conversation, there may be a delay or echo. Of course, I notice it most when I talk to my mom, so maybe it's more about my mom than Ooma!
To be honest, I don't think I would want to have a lengthy heart-to-heart conversation using Ooma. The sound quality just isn't solid. Nevertheless, I have no regrets about getting it. Most phone calls these days are relatively short, so it suits our needs just fine.
Just to add, we have little to no cell reception in our house, so we weren't willing to get rid of the land line altogether. The phone number transferred easily for us.
