Depends what kind of signal strength you can get - in my house I am in a good signal area but this various from room to room. But to answer your question, I have a Hauppage TV USB stick with a £9.99 indoor freeview ariel (from Argos) and the picture is every bit as good as the freeview from my main house ariel. But as I said this can vary from room to room. The small ariel supplied with the USB stick was next to useless for me.
I don't think my version of the tuner has digital text though, but I know others do.