I signed up for Office365 about 3 years ago. I got the Small Business Package specifically so I could use my own domain, but I got the option without the office license - $60 a year. I'll be going to the $150 option that includes the license this June for a few reasons, mainly because I need the newer versions of office to do some work with specific clients. I'd like to have current versions on all my devices, and the subscription is much cheaper than buying a bunch of licenses.
Some other thoughts on Office365:
1) As another member mentioned, I can (and do) deduct the expense.
2) Exchange. Really. Exchange is the gold standard. I hacked around with iCloud, and Google and had nothing but problems getting all my devices in sync. Some things synced just fine, others would be missing data, and the interfaces were always different and half-baked. In the 3 years I've been on Office365, I've had zero problems with Exchange. Everything syncs on all my devices, and I even have it in the cloud. So, yeah, Exchange has easily been worth the price of the entire subscription.
3) Syncs all my docs with Sharepoint (OneDrive for business basically), on all my devices. Everything is accessible on my devices and the cloud. I can get stuff done anywhere on basically anything.
A number of my clients have tried the iCloud route because it's free and "it's also an apple product so it has to work". After it wiped out the work calendar for one (and attorney) for the 4th time, he had enough. Happy as a clam with zero problems after 2 years. Another can't use iCloud integration with his Mac because it's too old, and Apple doesn't support it on is OSX version. He switched about 3 months ago and couldn't be happier to be able to sync all his information again.
While you need to have a small business or enterprise subscription to use your own domain, it's fairly easy to use forwarding for email to send from your other accounts. Domain use, space (Onedrive/Sharepoint), and Active Directory integration are the major differences between Home, Small Business, and Enterprise.
Office365 isn't for everyone, and subscriptions aren't for everyone, but the Office365 subscription isn't just a software license, it is actual services. I don't get the hate for paying for that kind of value. If you don't use office or need all the bells and whistles, that's great for you. If you need them or want exchange services for your email, $69 or even $99 as a non-deductible expense is still an absolute steal. All that for $150 deductible doesn't even require thought.