Got one to replace a Note 2, so the size hasn't been an issue for me. However my first handset was a real Friday afternoon job with constant reboots when connected to wifi. Second one is stable as a rock. Agree with the comment about software, Sony's light touch with Android is a pleasant surprise after the Note 2.
I'm used to the Note 2 size, but I'd have to handle a one else max before considering it. On paper it just looks too big. I do like that flip cover with inbuilt additional juice. However that just increases the bulk