I love this topic, because it's totally up my alley.
I love Fujichrome MS100/1000 (RMS), even when I'm dealing with questionable expired batches I've bought from eBay. I use it (and came to love it) for two reasons: available-light shooting in unanticipated circumstances and low-light grain. When fresh, RMS is astoundingly flexible with both contrast and colour rendition, though in my experience it tends to be a bit cooler in tone than the Provia stocks I've used. When the post-expiry storage is questionable, I've had hit-and-miss results, but probably no more so than with other expired-and-stored-dodgy stocks I've tried in the past. Where originally, I shot RMS in 135, I do most shooting in 120 (and would, if I could find some for sale, 220).
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RMS images from my flickr should give you an idea as to its latitude in freshness and staleness alike. Pretty much everything dated 1998-2000 was fresh stock and 135. Of the expired stock, all shot this year, those shot January 16th-21st and then July 2nd were stock where colours didn't drift.
The
biggest issue I'm running into, though, is having the rolls developed at the shot ISO speed I select (I tend to push it nearly always). The local pro lab destroyed three rolls from Earth Hour in March and then destroyed three more from June. Since then, they have bent over backwards to assure me this won't happen again, wherein the lab tech under-developed my RMS rolls shot at ISO1000 by three stops. The lab tech, while evidently "experienced", never saw this film before in his life and didn't understand the very clear instructions written by the customer service desk or the shot speed and number of pushed stops I wrote on the sealed roll itself -- causing extreme distress and tongue-lashing at the manager by me, while the manager apparently screamed at the lab tech so loudly the second time this happened that it freaked out customers and staff alike, given his ordinary quiet demeanour. Somewhere in there, I dryly said to the manager that "with recurring problems like this, it's small wonder people want to migrate away from film."
So if you start liking this stuff, just be sure your favourite lab knows what you're giving them: an ISO100-rated film that can be pushed 3 1/3 stops to ISO1000. Otherwise you'll end up with a disaster area like I have (enough to shake confidence in using RMS if not careful).
If I could, I'd spend money on a huge batch of RMS which I know for absolute certain hasn't been brought out of deep freeze in the entire time of its post-manufacture lifetime, since it's what I reach for first when going out on a shoot and would love it if a comparable stock were still commercially available new.
But there is an exception I love as much that's even harder to come by: Konica SR-G 3200 (which was also noted earlier in this thread).
I was only able to obtain two (new, fresh) 135 rolls of this stuff in early 1998 for that year's batch and chose it precisely because I wanted a strong colour grain texture. A few
SR-G examples are also posted in my flickr stuff. Note: while all were shot in 1998, they were kept in the freezer until late 2006 before being processed at my nearby Shoppers.
Results from shooting a well-preserved roll now with immediate processing may yield different results, of course, as I seem to remember that large-grain emulsion doesn't preserve as well in deep freeze versus finer-grained alternatives. Anyone know why this is?