Can't speak about the 3500. I bought the 1750. My phone routine is the same. I unplug at 4:30 am. I travel 4 days a week. My phone usage is fairly close from one day to the next. With the stock battery, by the time I got home, which was around 6:30, I would have around 30-35% left. With the new battery, which I just got Tuesday, 2 days with it installed, by the time I got home, I still have about 65-70%. Tonight was a bit later than normal, around 8 pm. I unplugged earlier today too, 4 am. At 8 pm I had 60% left. Today I really used the phone more than normal, just to test it. I am happy with the results.
Was it worth the $59? Hell yea. And in case you read other-wise, the back cover fits perfectly over the new battery.