This is the first time I've seen a CRT filter that even remotely replicated how CRT TVs look. Most just blur everything, slap on black bars and pretend they look anything like what real scanlines actually looked like, and call it a day.
THAT SAID
It's interesting, because I think we're in an age where people tend to value the crispness of pixel art over the reality of how the games actually looked. This is especially true of people who were introduced to those games via PC emulation, I think, where all the pixels were preserved.
I honestly don't know where I stand on the issue. It becomes a very per-game thing. Yoshi's Island, for example, almost demands a filter of sorts to make that pastel aesthetic work, but if anyone even thinks of slapping a filter on Street Fighter III, I'll cut them.
For sure it can depend on the game. The benefits in Suikoden 2 are clear...just look at the ground. In the non filtered shot it's dithered to hell and back. In the filtered shot its a nice, smooth gradient (likely the way it was meant to look with the dithering).
Also, this is what the shader looks like for Final Fantasy VII. It decreases the overall IQ, but makes the whole scene a lot more cohesive, IMO (characters don't stand out from the low res backgrounds).
raw
Natural Vision