Thanks for the quick reply!
One more quick question if you don't mind. I also have a dreamcast I play occasionally, and on my old hdtv I could use a VGA cable with it to get a pretty good looking 480p. But on my new tv, it just says "no signal". I read online that it may be because it won't recognize the particular resolution even though it has the VGA input. Which sucks.
So, is the XRGB mini any help with dreamcast? How about N64, Ps1, and Ps2? If it will help all my old machines look nice on my hdtv, then it may be worth it. If it is only gonna be useful for my 8 and 16-bit consoles, I can't justify that.
Then I would need to decide whether to also get SCART cables where relevant. Kevin Larabee's video on the XRGB mini he just ran composite through it and it looked amazing. If I could get that image quality, I'd be stoked.
The Dreamcast VGA signal is somewhat unusual. It's technically a 720x480 video feed, which is the same as standard 480p, but only the middle 640x480 pixels are actually filled. Some TVs, monitors, and processors just don't handle that correctly. Some assume that the video is standard 640x480 VGA through and through and scale it incorrectly as a result. Some can't display a picture from it at all.
You need extra hardware to connect a VGA source to the Framemeister, as it has no VGA input. Specifically, you need a sync combiner. (VGA is RGBHV; the input on the Framemeister is RGBs.) Older XRGBs have VGA input and output and will just take it straight-up.
Personally, I think a dedicated upscaler is worth it for sources that are primarily 240p and 480i, which includes almost everything up to and including the PS2 generation. For 480p and up, I don't think extra hardware is necessary.
Using composite video on an XRGB is usually a waste of money. In cases where you'd need an expensive or fairly intricate system mod to get a better video signal (NES), then I think it's reasonable to just settle on what the system does out of the box, but for systems that actually output RGB natively (Genesis, SNES, Saturn, PS1, Dreamcast, etc.), it just seems crazy to throw down $300+ on the box but skimp on the cables.