I've got the thing and it is way too big. It's heavy, kind of clunky, and doesn't do a whole lot more than my phone. It's quite possibly my worst Apple purchase of all time (and I've owned a G4 Cube). That said, I'd probably change my tune if iOS were optimized to accommodate the hardware in some way. And I'd I'm not being picky here. I'd take anything, really - additional multitasking options, bluetooth mouse support, a file system, whatever. It just needs something to justify the "Pro" moniker besides the Apple Pencil (which isn't even included with the device!).
I wish they'd unveil an iPad with the same 1536px height, but a wider aspect ratio for professionals. We don't need a giant square, we need room in apps for toolbars, property and layer panels so we can have room in the center to see all of what we're working on. 4:3 doesn't work well for Pros, especially since most of us are designing content for widescreen viewports from mobile up to desktop. So how much sense does it make to use a 4:3 display to design for 16:9? 2734 x 1536 would be a great place to start. Apple has built some responsive tools into Xcode to scale apps, so it wouldn't be that crazy to extend the UI out from center when held in landscape. It would be like optimizing apps for iPhone 5 when they only changed in one direction and kept the same density.
And when it comes down to it, I don't even need a full file system, just a better way to manage projects and the shared resources between them. If Apple can build something better than a file system that simplifies that process, then fine. But until then, a basic file system is still the best solution. I hope they're at least taking their time to design something better and not just flat out refusing to acknowledge the issue. I tend to think they're not dumb so hopefully this is like copy/paste and they just have to work it out. But until then it's nearly impossible to do things such as design for the web on iOS, especially if you're a full stack designer/developer such as myself. However, some things have gotten much better. For instance, Lightroom Mobile now supports full-res RAW import which I am over the moon about. And the Apple Pencil is the best tablet drawing device around, so I can still use it to make sketches, wireframes, and even more professional looking drawings and paintings when I eventually buy a Pro.
So at best, currently, the iPad Pro is an expensive accessory to the Mac for the professional user for most purposes. Lightroom is beginning to call that into question, but you still can't color calibrate your display on the iPad and I'm not sure how well you can setup high-quality large printers to use with the iPad. I know the newer versions of my Canon Pro 9000 MkII now have AirPrint but I doubt they have many advanced print options you can set, unless maybe one needs to download a specific app from Canon or something. But for me with RAW import and gradient adjustments, I can do 90% of the work on my iPad and do final color work, brush adjustments and prepare for print on my MacBook Pro.
I'd be happy with the iPad Pro if I could do even 80% of my total work on it, but right now it's maybe 50% if I'm being generous. It can handle about 80% of the typical work I do while at home (excluding freelance), but it does much of it much slower than when I just get on my Mac. And it doesn't really have to do with speed but software limitations in both iOS and third party apps that just aren't at that same level of polish yet. Being frustrated with the iPad for years (while also loving it, I get frustrated at the lost potential) has really made me appreciate my MacBook Pro even more because it just does whatever I need it to and doesn't complain or resist. I'd really like to get the small MacBook, but that can fold around flat and supports drawing with the Apple Pencil. I'd spend a pretty penny on that! I'm also hesitant to buy a machine that maxes out at 8GB RAM soldered onto the motherboard when my current four year old MacBook Pro has 16GB. I'd pay for more if Apple offered it! Perhaps the best bet is a MacBook + 5K iMac and sell my old MBP and not even fool around with upgrading my iPad Air 2, which is still going strong without issue.