It was terrible for the first half of the year, really soul crushing. But right now I feel pretty good about everything. Feel like I'm finally starting to get the hang of things. I've had a tougher time dealing with it than most people though, as most of my classmates are traditional students or very close to, so they didn't really have a home, per se. I had to uproot from the life I lived for 12 years to a state I'd visited twice before- it really sucked, and it made every aspect of things harder. The workload is insane, but you get used to it. You'll do things you never thought your brain was capable of.
As to the osteo bit, you actually do learn a few nice tricks that you can do for friends and family to instantly relieve pain and such, which is honestly pretty cool, and a lot of it actually works believe it or not. Still, I'd recommend most people go MD to dodge the hassles of two sets of boards and the extra hurdle of learning OMM if you don't intend to use it. Plus, you know, so you don't close a bunch of doors specialty-wise. I want to do psych, most likely, so that's not much of an issue for me, but for many people it will be. Go MD if you can, but if not, DO is a great option.