I currently have an SBIG ST-7XE-- this version of the ST-7 has the enhanced blue chip and utilizes USB for downloads. I have a line on an almost unused ST-7XME (maybe completely unused) and am wondering whether it would be worth acquiring it (and then selling my current one).
Is it enough of an upgrade to fool with? The XME version has microlenses over the pixels for higher quantum efficiency, but I think that is the only difference between the two models.
I use it only for photometry so the small chip size is not an issue.