I use mine a good bit, even though I am working from 9-5 or so, I still check my phone for scores, I message people using Messaging and Whatsapp and Facebook. I check the weather about four times a day, so syncing there might use some battery.
I have about an hour on the road combined, to and from work, where I have to use 3G, otherwise at the clinic I use WiFi, although sometimes I pull my phone out my pocket and it's on 3G, not WiFi, and picks up WiFi after ten seconds or so of use. Weird.
Sprint coverage in my area sucks dick, at least for data. Voice is decent. I wish Sprint had an app like Verizon did for checking how much data you used on your current billing cycle, minutes, etc. If I have to check, I have to take time to call a number for minutes or create a Sprint account and log in there. Haven't done the latter, don't have time for the former.
Get on your shit, Sprint. You have one for iOS.