I've played around with the unlocked model and it's not that bad a phone. It's a lil big but I got big hands anyway. Honestly it's really not much different than using a note 3. Performance wise it runs pretty smooth. You do get that occasional "touchwiz lag" that Samsung is famous for but nothing to bad. Sound quality and speakerphone sounded decent. Its worth 400 IMO. As stated before the nexus 5 is the better purchase but if your looking for a phablet or a note type phone you won't go wrong with the mega either.