Does any of this add input lag?
Besides the blurriness issue, is there any other reason to choose the Framemeister?
The Framemeister has about 20ms of input lag, but since it outputs at 1080p/60, it can actually be less lag than if your display was trying to process/upconvert the signal itself. Having used the Framemeister with a variety of systems (and more to follow), including an RGB ColecoVision (mentioned in this thread) and RGB Intellivision (in the other thread), I can't notice any lag, and that's even when using an Avermedia capture device prior to going to the TV (I'm using a Sony PlayStation TV for all of my tests).
You use the Framemeister if you have composite, S-VIDEO, component, or RGB consoles or computers that you want to use optimally on modern displays. It also has HDMI input, but there will likely be few instances where you'll want to plug a native HDMI device into the Framemeister, unless you want to add things like scanlines or other types of image processing. The only disappointment is not having VGA input. I'm going to experiment with VGA to HDMI adapters, but I will most likely just go straight to a VGA display in those cases.
Another thing I'd like to point out is that while the output of the Framemeister is amazing, it doesn't do much with composite signals, which are already pretty low quality. It does allow them to display about as nice as possible on modern displays, but the output really only shines at S-VIDEO or better, since you have a better source signal to work with.
I'd also like to point out that I'm doing my comparisons side-by-side with a Commodore 1084S monitor, which is among the best and most versatile vintage monitors. For composite signals, I tend to prefer the 1084S over the Framemeister. For all other signal types, it's generally a wash, i.e., both look fantastic.