I've owned the original Incredible and a Bionic, my Girlfriend and Daughter both have Incredible 2's and a co-worker has a Rezound. I'm also the go to tech guy for phone setup, etc. in my company so I get to see lots of phones pass by me.
First, I have to say that the Bionic was the biggest piece of junk I've ever had. Poor quality, Wifi to 3G to 4G switching was terrible. Never was solved. Hated the 4.3" screen, felt too big and bulky. Battery life was terrible without the extended battery which made the phone a brick. I swear i'll never buy another motorola phone again after that experience. Luckily, I signed up for only a year so I was able to get out of it really quickly.
My original D-Inc was a great phone with the exception of the battery life. In fact, I kept it for a spare in case I had a problem with my Bionic so I re-used it for the last 2 weeks before my contract was up. The Bionic became unuseable. The D-Inc. was great, even did some software updating after not being used for a year and became faster with some better battery life so I was pleasantly pleased. I held out for the D-Inc 4G because I think HTC makes a great phone. I was right.
I use the phone mostly for talking, but I do use it to surf when I need to, texting and mostly e-mail. I don't download a ton of Apps. I use Dropbox a lot for photo's, files etc. and use it as a Sonos controller. I have to say, the phone is fantastic, speedy and not battery hungry. Like most, I charge my battery when I go to bed at night and I've yet to have a problem with battery life throughout the day. The size is fantastic and would NEVER consider an SG3 simply because of that screen. I'm a business man, I don't need to be showing YouTube videos to my friends like my kids do. I understand that there is a phone for everyone's needs, but this one works perfectly for me. It hasn't randomly re-booted once, the Sense 4.0 coupled with ICS is flawless. Screen transitions are nice and seamless and , dare I say, acts more like an IPhone. Images are crisper, I love the new 4 x 1 weather/clock widget (coming from the original D-Inc where the default was a 4 x 2 and you had to create or download an App to get you enough to make your own 4 x 1). The 4 x 1 doesn't take up too much space on the screen and doesn't feel "heavy" like the 4 x 2. I like the new favorites folder where I can put in the Apps I use just once in awhile instead of having them strewn across multiple screens. My only complaint still is that your HTC favorites people list widget works great, but you can't change the order of the people, they're alphabetical. That was the only thing I miss about the Motorola version. I've had some Bluetooth crackling from a shorter distance away from the phone than I'd like but I can live with it. It boots fast and I never turn off any services (4G or otherwise) to conserve battery life. All in all, it's a great phone and does what I need it to do, RELIABLY, which is what we all want