I'm still using my iPhone 3G, but my contract is up this month. I haven't decided yet to go to an Android phone of iPhone 4.
I use Google Apps for work and personal stuff everyday. So far I really like it. I get emails about once a week of new features that they have added, and have started playing around with Voice and Sites.
I have to admit, that my company is a Google Enterprise Partner, and I am new to the environment. But I have so far gotten fairly positive feedback from potential clients, but also wanted an everyday persons (not someone I'm trying to pitch to) point of view.
I also have to say that I do feel that a ton of information on us is being collected, but on the flip side of the coin, the integrated smooth way in which Google products work for us wouldn't be possible without some of that info.
I started using Google Gmail years ago, back when you still had to be invited by someone that was already a user... I don't really remember the year, but fast forward to now.
I have a Nexus One mobile phone that syncs my contacts, calendars, email, & photo albums from several accounts. My wife and I have a shared calendar that keeps us on the same page (no more phone calls about if I forgot about...)
Any changes made to any piece of the digital puzzle gets pushed to wherever I am; on my phone, laptop, tablet, wherever. The sync and anywhere access is what sold me. I used to be a Windows Mobile/Outlook user; Google took the hassle out of staying in touch and up-to-date with all my stuff.
Google Docs is great! I scan important documents, upload to Docs, and access (and now edit) from anywhere. Certain folders are shared with family members, just adding a doc to the folder gives them access.
I have migrated the company I work for from Exchange to Google Apps. All the same great features of the personal accounts, but for business.