The z520a is by far, the best mobile I have ever owned. Originally, I believed the 16 MB would not be enough, but it turns out to be plenty as long as you upload your pictures and movies every once in awhile onto your computer via bluetooth or IR.The second screen is not only an excellent way to take pictures of yourself (it acts as a "mirror" of sorts), but is also a great way to save battery life if you happen to be an impulsive cell phone checker (checking the external screen saves more battery life than opening and closing the phone), as you can check the time and date, as well as checking if you have missed calls, messages, or voice-mail.The outward antenna isn't an issue at all, but if you're a stickler for looks, it honestly looks fine. The speaker on the back can handle much abuse as I have mp3 ringtones that use much bass, and the speaker doesn't have any issue playing them.A+ for an excellent phone, and likely the best phone I'll ever own for its price!