I never go for dual GPU setups and always prefer a single, beefier card.
Such setups do work in many games but they are often problematic to get right and by the time they are fixed, the cards might be obsolete.
Of course i don't mean high selling FPS titles or sims like DCS that also sell software to military clients (these companies can hire more people and get more work hours per month to fix the problems faster), but flight sims that are made by small teams of 20 people or so, like CoD and RoF.
RoF had troubles with SLI too for many months (maybe more than a year actually, just like CoD), i remember reading many requests and complaints about that too. There were also other issues as well, like "shimmering" ground textures at long range, improper use of multi-core CPUs (i think it was dual cores that crashed if the OS was win7 or vista), FM issues, CTDs, no FMB documentation, limited online playability and limited offline usability (there was no dynamic campaign and the flyables were fewer than what CoD has).
It all sounds very similar to the issues CoD has and it took about 18 months to really fix.
For me this means that given time and provided the teams stay in business, things do get fixed, and that's why i remain optimistic about CoD.
The main thing that kept me away from RoF was the micro-transaction model (i prefer to pay more and get complete expansions instead of buying planes separately) and the always online requirement, otherwise i might be flying it too.
However, to get back to the topic of SLI, since my preference is for this kind of games that are usually made by small teams, i know to expect a lengthy process of optimizations and fixes. So, i don't make upgrades that i can't be sure will be working and that's why i never use dual GPU setups.
If i was also playing a good deal of shooters or action games that are better funded and have lower graphic requirements in terms of view distance, map size, etc, then by all means i would think about SLI as well, but not when my primary focus is flight sims made by dedicated but small studios.
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