I wouldn't go as far to say 'SLI works fine for everything now' at all. Many games aren't even released with SLI support despite what they claim and others require multiple driver updates for optimization. I would agree that it is much more manageable, but that is primarily because of the ease and speed of driver updates these days. Games usually catch up and things are great, but do you have the latest nvidia driver, and game update, and your nvtuner settings customized, etc... But it has improved.
Having said that I won't be going SLI again, there are still just a few too many quirks for it to be transparent to the user and sometimes (but more rare) it is just downright frustrating.
Having said that I won't be going SLI again, there are still just a few too many quirks for it to be transparent to the user and sometimes (but more rare) it is just downright frustrating.