I moved from an iPad 2 to the Nexus 7.
My needs had changed since I bought the iPad as I subsequently bought an 11" Air to replace my daily computer, and the Air's near similar footprint, weight and instant-on to a 'real' computer kinda negated much of usefulness of the full-sized iPad. That said, I recognized there was a lot to recommend in the ability of mobile internet, email, e-reader, multimedia player and, yes, sometimes business app machine. Given I was already (though more by accident than intent) living in the Apple environment (iPhone, Air, iPad), I initially looked at the iPad Mini. Made sense. Same apps, familiar layout and operation, but it became almost immediately apparent to me its size/shape was odd for me - too wide and not really a handful.
Its then I turned to looking at 7" Android tablets - a size and shape not unlike a paperback, so an easy handful - and a majority of the apps I used on my iPad available for Android, so no real learning curve there. The Nexus appealed because I have had success with ASUS products in the past and, being 'The' Google device, its 'stock' Android OS (without bells and whistles) appealed. Well, that and the 7 was going to be some $200 less than the equivalent Mini.
All that as a preamble, I've had my 7 for a few months now and I like it. That said, I will admit I have found some apps (or their equivalents) I used on my iPad simply don't exist in Android (yet) and I have found that there have been some stability issues with it - but those I put down to bugs in the apps and goodness knows I did have to do a hard reboot of my iPad from time to time. Just not as often.
But, if you are happy with / familiar with / found workarounds for your Android phone, you'll find the same experience on the 7. And its size and weight truly is a marvel when compared to your iPad. Still not really pocketable (unless you wear cargo pants), its easier to include in a bag or briefcase - like I said earlier, the size of a paperback.
Hope this helps.