I've played with it in 149 and it's now worth trying. The exaggerated bullet glow that AAE shows in Asteroids isn't there, but that was never really authentic anyway (I just recently played a real Asteroids machine up at Funspot and there's no comparison to the real thing). I currently have vector glow turned on in Asteroids and Star Wars and kind of like it. For some reason, Tempest doesn't work right in 149 (even with vector glow turned off). Vector glow in raster games is also interesting and I spent some time trying to make it look like a real Galaga machine I had access to. I thought the effects were cool to play with and approached in some ways the real glow and scanline artifacting, but ultimately, when I turned it all off and just went back to the standard MAME bilinear filtering and scanline mask, I liked it better.