I do a LOT of keying, and, early on, was also exporting to AE/keylight. I rarely do that anymore, after installing the BorisFX keyer package. The keyer has an odd interface & takes a little getting used to, but does have a nice keying algorhythm. What I find most useful in that package is the Light Wrap, Color Match and Matte Choker plug-ins that come with it... I use them constantly!
I do also use the NewBlueFX keyer now and then, which is less CPU intensive and it does a much better job than the internal Vegas keyer. Plus, I can add the other Boris light wrap/color/matte functions to it, if needed.
I would still love to see "Keylight for Vegas", but doubt that will happen any time soon.
10 being the best, I would give the whole Boris keyer package a 7.73, relative to keylight. However, relative to anything else out there for Vegas, I give it a 10. I just can't imagine doing any keying in Vegas and not using the color match & light wrap plug-ins... the light wrap is added as a compositing plug-in, not as a video "effect". Playback will slow a little, but it absolutely helps sell the shot, and the wrap color will change everywhere the background color changes.
As for the actual keyer layout, it's a little strange, but pulls a nice key when you get to know it, and the initial click gets you very close if the GS lighting is tolerably uniform.
Keylight is much more visually intuitive, which is why I gave Boris a 7.73 vs. a 9. I would say the Keylight keyer is "1 better" in the algorhythm dept.
While not crashproof, the BorisFX have been more stable in V11 than the NBFX plug-ins, for.me. Where that problem lies, we ALL want to know :/.
For the record, I have no affiliation whatsoever with BFX... merely a user that has explored all other options, and found the support staff to be excellent to work with, including follow-up calls to see how things were working :).
If I had any recommendations for Boris, it would be:
(a) Make it so I don't have to uncheck/deactivate the plug-in box to color pick (like NBFX does), and/or allow a user-defined default.
(b) Redo the layout, especially spill control (though the default spill clean-up is great and I have not needed to muck with it more than once, I believe?). Keylight just seems to have nailed how users like to approach individual controls and parameters.