I have had lesser smartphones before, but this is the best one yet. Not tried the full blown S4, but the S4 Mini is still a powerful phone with lots of features that I still have to dive into. Great camera, sounds good with music, have set it up for both personal and work e-mail accounts, and, oh yeah, its a good phone too! The S4 to me is just too big, the S4 Mini fits nicely in the hand. Sure, a bigger screen would be nice for watching videos or TV (I have also set it up to receive Sky Go), but the Mini is still very watchable.
So, if you can't get your hand around the bigger S4, then try the S4 Mini, it's still a great phone.