I love my SP3 because I only use it for basic computing. I have my desktop rig for real computing.
But I agree with anybody returning it because they need a more high-end laptop for power use on the go. While the SP3 is somewhat of an ultrabook, it's not meant for high-end power use. It's meant to be a laoptop/tablet for normal use. If you're a power user, that combination isn't advisable. It's advisable to get a power notebook.
What I don't agree with is people getting Mac Pros. I see people getting Mac Pros, then installing Windows 7 on it. It's soooo pointless because Mac Pros are just completely overpriced, and relatively not very good.
Anybody looking to do portable power computing, this is the way to go:
http://www.dell.com/us/p/inspiron-17-7737/pd?oc=fncwj1904b&model_id=inspiron-17-7737
Sure, you can uninstall Windows 8.1, and put in Windows 7. The touchscreen will still work. But when it comes to OS for this generation, I highly recommend you refrain from veering away from Windows 8.1. Sure Windows 7 is an excellent OS. Probably the best in terms of mixing great stability and great capability.
However, W8.1 still runs all the greatest Windows software without a hitch. And on top of that, it allows you to install WinRT software. You can't install WinRT software on any other OS. You can only install them on Windows 8 or Windows RT. And the thing about WinRT software is that it has the fastest growing selection of software in history. Far more faster than normal Windows software, Android, Apple, etc.
The problem is that people like to complain because they install underdeveloped WinRT apps from random developers. And when the app bugs out, they blame it on the OS. The OS is fine. WinRT currently doesn't have as large a selection of tried and true mini-apps as other OS. However, it does have have a very nice share of excellent stable products. And that list is growing at a rapid rate.
My advice for power users. Go with that Dell touchscreen over Apple garbage all day long. And if you don't mind a 14" screen, then get BY FAR the best power laptop on the market.
Razer Blade 14":
http://www.razerzone.com/gaming-systems/razer-blade
Sure it's touted for gaming, but it is absolutely perfect for high-end productivity software. The video montage in their commercial even showcases it using Premier Pro as well as 3DS Max. It makes the Mac Pro look like a jalopy.
As for OS, definitely stick with Windows 8.1. It will take you everywhere. Stay with the tried and true WinRT apps if you're not comfortable with the more underdeveloped ones. Or go ahead and mess with the less developed apps, but don't expect them to be completely. Many of them are wide open for user feedback and bug reports for improvement.