Overall: Good phone; SOLID build; reasonable battery life: 2.5-3 days with an hour's talk time + some PDA-work (and cheap spares), good QWERTY keyboard for SMS/e-mail, syncs well with Outlook (appointments, contacts). Decent documentation.Phone pros: good/decent signal, good/decent call quality. Good external numeric keypad. Predictable battery life (2.5-3 days, though I talk maybe 1 hour in that time). Got a spare battery off an online auction site for cheap. Can use .wav files as ring tones (MP3 -> .wav via Audacity? I haven't tried). SOLID build.Phone cons: somewhat large (candy-bar with a big screen!), have to get used to the earpiece position (can't rest the phone on my ear)... And once, though the keypad was locked, the phone (slipped into my pant pocket) called up my friend. Weird. But that hasn't happened again. Ringtones could be louder.PDA - I can sync my contacts with Outlook and keep track of my appointments, which is all I really want. Have also managed to use Gmail via POP3; the VoqMail application does not support POP3.(For POP3, you have to enter the server IP address and port completely (pop.gmail.com:995, smtp.gmail.com:465), I had some trouble with that. Internet connection via GPRS also has somewhat of a weird work-around - look up the cingular.com FAQ for setting up the Audiovox SMT5600 SmartPhone, nice screenshots.)PDA pros: QWERTY flip-out keypad good for notes, contacts, appointments. My fingers are not slim, but not fat either - so I can enter data/SMS at a good pace. SD expansion slot. Windows Mobile 2003 SE actually, FWIW. "Flight" mode - but I still turn it off in the plane!PDA cons: Has frozen (only!) a couple times in 3 months, can't find a reset pinhole, so took out the battery... (momentary flashback of my last PDA - a Toshiba e310).Have had the Sierra Voq for over three months now, happy camper. Way better than the Motorola v180 (which it replaced) or the e310. Now, if only I could get a decent non-leather cover for it... Too bad Sierra stopped production, but if they hadn't, I wouldn't be able to own this wonderful phone! One man's poison....