I have no data drops or lost phone calls at all. There is a video with an M in paper towels with great signal but as soon as you remove the towels, data weakens. I have a gel case on my phone so it may be the difference.
Last weekend, I was with my family all over the country side, in 3g, weak 3g areas and in 4g areas. There was a sprint gs3, sprint nexus, at&t iPhone 4 and another basic Android. I was the only one to get service without fail. They had to ask me so much, "check this website, make this call" etc, they ended up totally giving up even trying on their phones and going directly to me.
My data has been flawless...usually between -82 to -93 dBm. I'll have to check the next time I'm in strong 4g to see what I get.