I personally own an Xperia Acro S but both of it's microphones died after i tried to clean the ports with compressed air.
I've been looking at the Z1 Compact and considered buying it, but after seeing this one i changed my mind.
This one is just so bad ass.
The open waterproof 3.5mm jack is definitely a big win. no more cover flapping around when i have a headphone plugged in for music.
And that skin is awsome, orange is the perfect colour for a Sony phone, I had a W550i also in orange and it caught everyone's attention everytime I took it out.
Not to mention that it also has Linus logo on it which is totally bad ass.