I was pondering this question last night. I did a ton of research on smart phones before purchasing the Eris.
My Phone prior was an AT&T quikfire, touch screen, slide out keyboard, multimedia phone. This thing was a freaking pile of smelly crap! Touch screen was horrible, froze up, internet service was a joke, the only thing it could do well was text and make calls. It was stolen out of my car a few months ago, and with the experience I had with it I didn't want another cell phone. But I got tired of not being able to text my wife, or call her to let her know I was going to be home late, ect ect. So I started a month long research project to buy a phone.
I wanted, Internet, a decent camera, maps of a sort just in case, a good display, facebook access, and just something cool to play with. I searched and search, playing with my friends blackberrys. None of them impressed me, small screens, tiny keyboards....I did like the blackberry storm, but watching my buddy having to take his battery out two times a day to fix a lock up didn't appeal to me. Plus the iPhone, well I'm not a mac fan boy, and I certainly am not an AT&T fan at all, they suck in many ways. At my work place with an AT&T phone, I can stand next to someone with a Verizon phone and have no service, when they have full service.
Then one day a guy came into work with a Motorola droid. I hated the look of the phone, it was square and bulky looking, didn't care for the pull out keyboard, but the Operating system and internet was amazing. So that started my research into droid phones.
I stumbled upon the Eris on Verizons webpage and went over to the store to check it out. They had a little kiosk set up with the phones there so you could check out the features. I sat down and started messing with it, found the 7 home screens, the huge list of apps in the market, the internet was amazing, google maps built in(and voice nav with my 2.1 update) and all the ways you can customize your screens, I fell in love. 79.99 buy one get one. Plus the price of 79.99 buy one get one was a huge point over anything else in the store. I ended up buying two, one for me and one for my wife, and canceled her AT&T phone.
She loves the phone, but she can't get used to the touch screen keyboard. I downloaded the better keyboard for her. The buttons are bigger and that seems to help her some, but she still complains about that.