Ive got the HOX however have used an S3.
Got to say no problems with the HOX, am a big fan of sense UI as Samsungs OS seems to look a bit boring and dated.
Ive had no problems with the HOX and had it for 5-6 weeks now being used everyday.
Dont see what the big issue with non-removable battery and memory is, the Iphones have all been like this and there popular enough. It wasnt an issue for me when choosing a device