S4 vs OnePlus One - worth the upgrade?


Android Expert
I am thinking of buying a OnePlus One. Since they are like hen's teeth at the moment I haven't had the opportunity to have a proper play with one and am unlikely to get one either.

Does anyone here have a OnePlus One or had the opportunity to play with one?

I am wondering whether it is a worthwhile upgrade.

Just in case anyone starts asking why I am thinking of upgrading if I am happy with my S4 (which I am), I need to buy a new phone for my non-techie wife and I'm trying to decide whether to buy here a cheap Android like a Huawei Kestrel for about