It is really a stunning phone, however there are a few niggles.
The external speaker is terrible, with or without the enhancement switched on.really low and crackly.
Signal quality is poor. Had a galaxy s3 and never had an issue. My phone is 90% of the time on Edge, as opposed to the opposite with the S3.
Voice quality is very soft, very hard to hear even with volume up all the way.
Almost regret buying, maybe should have waited for S4.
First of all because of the waterproofing the external speaker is not amazingly good - but it is not that bad though and I have not experienced the crackling and whatnot. My signal bar is 90% of the time at either 3 or 4 bars and most of the time it is on LTE or H+.....only time I get edge is when I set it to GSM only
I'm very happy with the Z....not a perfect phone but perfect for me
Only issue for me is the average quality of the camera....but apparently that will be sorted out on future updates.