love my evo 3d, the speed is amazing. Had the EVO 4G prior. camera was higher res on the 4G but 3D is cool on the new one. Call volume seemed louder the 4G, but i can deal with it. I highly recommend the EVO 3D
As with all phones I buy, I recommend getting the extended battery. Seidio has a 4000mah battery for $75ish, its a bit pricey but id rather pay a little extra to be able to use my phone to is maximum potential than worry about it dying halfway through the day. With the extended battery I use everything to the max and only drop to about 40 at night. (7am - 10:30 / 11pm) heavy use: auto brightness, bluetooth, gps, wifi, use latitude throughout the day, lots of web use, some video chat, lots of pic/video taking and uploading (facebook, google +) music, occasional movie, trapster, facebook, twitter, news feeds, sprint protection app (set at 10 minutes), NPR audio feeds, gasbuddy, live wallpaper (for my photos), photo lockscreen...
I didn't think dropping to 40% was so bad, considering how much i use my phone and what I do with it. I personally have no complaints. I have a solar charger that I have the option to use when going for a hike in the woods or if i'm at the beach and of course my car charger is always available.
http://www.seidioonline.com/product-...40hev3d-bk.htm