The recently uploaded (2 days ago) DaVinci Resolve Lite (free) finally works in my Win 8.1 with AMD video card, previous beta's did not. The 700++ page manual that accompanies it will take a while.
To each his own...I actually find Resolve to be easier, quicker and more intuitive, than Vegas for color correction. I also think the preview screen in Resolve is more accurate than Vegas, even when it is set to "Best".
Anything not related to coloring is clumsy in Resolve. I use MXF to and from Vegas and Resolve as an intermediate. Works great.
Resolve is designed as a single screen application, so to get a second (e.g. full screen on a grading monitor) up you need more equipment. To properly monitor the signal from Resolve or Vegas, you must output through a DeckLink Card via SDI (DeckLink SDI, Studio, 4K Extreme etc) which is 10-bit YUV, then send that signal to an HDLink Pro DisplayPort, which converts the signal to RGB for input to the display port of your grading monitor.
You can drive a secondary monitor through a BlackMagic Intensity Pro card, but it is 8 bit and made my Dreamcolor monitor default to full gamut colour (not much good for grading), which looked almost right with Resolve but nbg with Vegas.
On paper the cheaper Decklink mini-monitor card will do the job, but in fact doesn't work with Vegas.
Perhaps a cheaper alternative is to use Resolve on a large calibrated monitor.