Had this phone now for a couple of weeks and pretty much already loving it, although a couple of things have given me trouble from time to time. One, being the e-mail syncing not being consistent and the other having to play with the camera quite a bit to get it to where I would like it to be. Overall though, so far it is easily the best phone I have ever owned.
I have the Otterbox Defender case for it and although it feels good to know the phone is so well protected and it has a nice grip to it, this case makes the phone too bulky and can barely fit in my pockets.
I'm coming from a BlackBerry Torch 9800.
Besides the Otterbox case this post pretty much describes my thoughts too. Although I'd like to add in that the Torch 9800 at least let you switch songs by pushing one of the volume buttons for a few seconds, it was convenient and the Evo 3D doesn't have that little feature sadly. Overall though I'm very happy with this phone.