This has been my experience as well as I have mentioned a few times over the last few months. SLI, like Crossfire, used to not do much in any display mode besides true Fullscreen. I don't know which driver changed how SLI works, but I'm going to take a guess and say when nVidia released the new 300 series drivers because there was a major overhaul.
What I've been telling people lately is that my experience with SLI has been positive, but that their mileage may vary depending on their hardware and the game they're playing. Normally, I would never straight up tell someone to buy two video cards for their system just so they can turn up their settings a little bit, because most people will be just fine (and happier financially) with just turning down their settings a little bit and only using one video card.
Good to know it seems to be working well with D3, though.

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