Faced with similar, I can't go iPad only. I have a 2012 rMBP that I use for work regularly. One of our main uses is a website that doesn't load at all on the iPad, also as good as the MS office suite is on the iPad there are just too many functions (for me) that are not available on the iPad or are much harder to navigate and do. Of course YMMV but I would still recommend keeping some sort of laptop or desktop around for the few uses that iPads just can't handle or handle well yet. Other than that I highly recommend getting an iPad Pro with the pencil and some sort of key board. I tried and didn't care for the ASK last year, and opted to go with a Smart Cover and keys to go Bluetooth keyooard.