I've looked into Imagelink, but not gotten any yet. Instead I acquired a couple thousand feet of Kodak copy microfilm (forget the number, & it's not handy at the moment). I have played with it a bit and enjoyed it. Basically it was dirt cheap and I'm just going to have fun with it. Hopefully I'll load some again this spring and experiment in earnest. I know I will not get great pictorial results, but it will help me understand things better in general and, most importantly, be fun.
It seems to be an EI of 1.5 or 3 (no actual testing beyond bracketing, so this is more an opinion) I can't rate much higher than EI 6 and really get enough exposure - though I'm sure this will change for me as I gain experience. I have experimented using an expo-disc to "pre-flash" the film, and it helped a bit.
Even though it is not Imagelink, I will have to try your suggestion of dull and cloudy days as well. Also, I would be interested in suggestions regarding development. So far I've used D-76 1:1 (8 minutes), and stand Rodinal (on several rolls, from 45 minutes to 2 hours), and I know I should probably try something customized.
I have spooled some for a coworker who absolutely loves the restricted latitude without trying to compensate for it.