Battery life is very decent as for input to should you buy the G3...
This is going on my personal experience its not flawless...you may encounter issues but be fortunate enough to avoid all.
Its like any product and more prevalent in massed produced items..there will be defective ones.
But as for all the main points discussed here at AC (touch wood) I haven't experienced what has been mentioned.
I do have a buggy auxiliary connection that if its knocked it will skip,pause or throw up voicemate, so there is my flaw and its becoming very annoying (can't place phone in pocket and have to carry in hand).
But that aside my experience of the G3 has been positive..
I would say give it a try...you have a 14 day window right?