I had an Android phone last year and when Verizon came out with the iPhone I got one. I left Android because I was sick and tired of all the little things that kept going wrong. The icing on the cake was navigating while on vacation with my dad, brother, SIL and husband and the phone decided to drop data and then reboot. Thank goodness I had printed paper but that was the last straw. I had the Droid X at the time. Bottom line...I felt like I was trying to get more out of the phone than it could deliver.
I was hesitant to move to the iPhone due to it being more controlled, but I decided I wanted something that "just works" more. So I moved to the iPhone and ultimately ended up with an iPhone 4S. It was painful for me...I remembered going from feeling "in touch" and aware of things, to just using the phone when I would make myself pick it up to see if there was something I could use it for. I don't quite know how to explain it to you, but the larger screen of the Droid X meant I would pick it up just to look something up on the Internet real quick....or to read my newspapers or check out some twitter posts. Even Facebook a little. I also had some games on there...and I didn't mind emailing and texting with it.
The iPhone and I made peace but I never LOVED it, despite having a macbook air and iPad 2 (so fully into the ecosystem). I LOVED my Droid X when it worked right.
My number one priority in a phone is that it works, and number 2 is that it can last the entire day. Long story but I experienced a family emergency that stressed me out tremendously and it didn't help that I had to spend the entire day worried I wouldn't be able to stay in touch with family members (back in my Blackberry days).
When the Maxx was announced I was hooked...the battery life could not be ignored. I'm a user who has iOS 5 on the 4S and my battery life took a dive and I'm frankly ticked that it's 4 months later and there has been no fix. So I thought what the heck...give the Maxx a try.
I had forgotten all the things I missed about Android....and all the pain points from moving away form Android to iOS. It's wonderful to be in any app and share something out, and to get an entire list of a gazillion ways you can share things...text, email, tweet, Facebook, Read It Later....the list is as long as the apps you have that can accept the data you are trying to share.
The Maxx has redeemed Android for me. The hardware can keep up with what I am making the software do. I've got Smart Actions that when I start my car launch a special car dock program with all my favorite programs right at my fingertips. And when I get to work it turns my wifi back on and automatically puts my phone on vibrate. When I get home it automatically turns my volume up and changes my wallpaper to something bright and cheerful. I LOVE this automation stuff.
Another thing I had against the iPhone is that I have never loved the 3.5 screen size. It's too darned small!!!!
Having said that, I had come to take for granted the one handed operation. I can't operate the Maxx one-handed...that's all there is to it. But the larger screen is more important to me. I can actually DO things on the Maxx...I can look at my budget spreadsheet and make changes to it, etc. I hated trying to do stuff like that on the iPhone.
So here is where you may struggle:
1) Size...it is huge when you are used to an iPhone
2) Camera - nothing beats the iPhone 4 and iPhone 4S camera. NOTHING. Maxx is adequate, but I had become comfortable considering the 4S my "main" camera. The Maxx will do fine most of the time but I will need to make it a point to pack my larger point and shoot camera when I'm going somewhere I know there will be photo pops
3) Bloatware. Maybe you won't care or notice...but it drives me nuts. I honestly think it's the reason so many devices end up with issues. The carriers force their bloatware on you and some of that crap can't be turned off, and then of course you may end up loading a bad app here or there. Apple definitely has an advantage in that they don't allow the carrier bloat on their devices.
Do yourself a favor and look at every app on your iPhone that you "can't live without" and see if you can find a comparable app on the market.
I am not regretting going back to Android with this Maxx. The ecosystem with Apple was good, and it's cool so many other people have one and you can talk "iPhone" with others...but I've found very few people in real life that want to do anything beyond playing Words with Friends. So aside from losing the ability to be a case ho since everyone makes a case for iPhone...I'm happy with the change for myself. I have an iPad to fill the iOS void and use Dropbox for files that I "must" have across platforms.
P.S. since you are coming from the iPhone 4 I will say that the Maxx will no doubt last as long as the iPhone does but on 4G...I can't say if the non Maxx razr will since I don't have one...but if I were in your shoes and decided to go Android...I'd DEFINITELY go Maxx over the regular Razr.