I'm probably going to buy one, but...
I'm probably going to buy one, since I'm a big fan of Google services, but honestly you can get all the Google services on iOS, but the opposite isn't true, you can't get all Apple services (iTunes and iMessage and FaceTime are the biggies for me) on Android.
In addition, Apple has much better device encryption than Android.
There are only two things iOS that annoy me: no swipe keyboard on the Apple - once you've gotten the hang of swiping on a Nexus 7, you never want to go back. I can match my physical keyboard speed and with much less fatigue. And I don't like the fact that iOS penalizes me in a couple of ways if I use Chome as my browser (Safari by default opens links, other browsers run slower due to design limitations imposed by iOS).
Yes, 512 mb on the mini seems inadequate, but my kid's mini runs fast and smooth, faster and smoother than my Nexus 7. Still, I do wish Apple would think about future proofing the mini by increasing the RAM. I wish they would be more considerate of my pocketbook in their pricing for each bump in storage capacity as well.
The thing really holding me back from a mini, for over a year now? Not the price or a few quirks. Simply, the lack of a Retina display. Even the old Nexus 7 has substantially better pixel density. The new even higher resolution Nexus 2 7" further raises the bar. I want to read books without staring at pixelated text!
Ironically, if Apple can shrink the upcoming iPad 5 the way the rumors suggest - mini-style thin with reduced bezels - I'd really consider going with one of those instead of the long awaited Retina mini - I don't hate on a larger screen, I just don't want to pay the weight and size penalty that go with it. If those "penalties" are reduced enough, though, the original sized screen in a smaller lighter body might be just the "right" size for me. Until I have one in my hands in a bricks and mortar store, I won't know.
BTW I have a hybrid usage model - I travel with a Nexus 7 and a 5th gen Touch. The Touch gives me a great camera, plus FaceTime and iMessage for staying in touch with my family, who are very i-centric (with iPhones and iPads). But since the Touch makes reading web pages and even using FaceBook a visual challenge, I simply switch to the Nexus for those chores. I never planned this, but it works, even though I'd rather just have one device! Yes I tried lugging along my iPad 4 one trip, but it mainly stayed in its case - too heavy to hold and balance, and the Touch was sufficient for iMessage and FaceTimed, the Nexus for the web and books.
Until that single, "right" tablet comes along, I guess I'll just have to be quirky in my favorites and usage.