We switch from AT&T to Sprint at my company about 2 months ago. This meant we went from iPhones to HTC EVO 4G's. At first not every one was happy since it meant a new phone a new system and not what we were used to. 

So after having the HTC Evo for 2 months I can say that I'm really loving it! Don't get me wrong the iPhone is an awesome piece of equipment, I used it for about a year, but it was lacking on the nerdier end of the spectrum. I love the iPod functionality in the iPhone and the games but some times I thought I was a little restricted on what I could and could not do. For one you have iTunes, I already had an iTunes and its account setup since I have a couple of iPods but this meant that I would have to wait for the end of the day to go home and do a backup at my home computer since it's where I had everything in regards to the iPhone. The Evo just hooks up to the internet and I can do what I want to do, I've even setup to backup some of my apps onto my Dropbox. I've downloaded and purchased some apps and it's really easy since I already had a gmail.com account.

The main difference I see is that the iPhone is more a phone with a multimedia/gaming environment which is doing a great job at it (I did have a 3GS not an iPhone 4). The Evo is more of a phone with a small computer (much more powerful than the first computers I used to play with). I love that I can arrange my desktop and put widgets and apps I want to have easy access to but I still have all the apps on my app drawer, which to me means a cleaner look. The multimedia aspect of the Evo is not the best but it works quite good and that's the thing, if I want an app for music there's tons that can be found on the market to satisfy what I'm looking for. 

So needless to say I'm very happy with this phone and enjoy tweaking it here and there. It reminds me of the good ol' days of changing icons and setting up your desktop and wallpapers when I first started to use computers. And since the company pays, I'm happy :)