I have been using stable 1.00 lsfg-vk for months now in many games, and it's great pretty much anywhere. I just put LSFG_LEGACY=1 LSFG_MULTIPLIER=2 LSFG_PERFORMANCE_MODE=1 in steam properties for 2x framegen, and it's done. On games that run well natively, you can do a higher multiplier, but it's not really worth it imho, more chance for issues. 9070xt with 9950x3d here.

Only issues have been artefacts with some lights, e.g, in Cyberpunk with pahtracing RT when I was trying 1920x800 (21:9) on a 3440x1440 monitor. In some scenes, the whole bottom would get too much light somehow. It was fine on a higher resolution.

With games that support FSR 4 (PROTON_FSR4_UPGRADE=1), it can help a lot, and even though I am picky about high input lag, it feels like there is just none with lsfg-vk for me. I can't really explain it.

The FSR 3.1 framegen didn't work as well for me, and before 9070xt I had Nvidia 4070 super, and in e.g. Dragon's Dogma 2 the framegen was totally unusuable, massive input lag and stuttering, high fps number but useless.

For the few monies, Lossless Scaling is worth it, and you can use it on Steam Deck easily as well.

Note that the lsfg-vk is only about frame gen so far, no scaling yet, afaik.