I have a Minolta 7 and I use it occasionally. I've shot maybe 5 rolls of slides in the last 2 years....so not that often...Slides are hard to use because you can't develop them like pictures normally. I think there are places you can do it, but normally you just get little slide that you can use in a projector. Or you can have them digitally scanned. But at that point there adds a layer of additional issue as you can f-up the WB and resolution if your scanner is not good.
Good slides as used by many are the Fuji Velvia series, I think they go from ISO 50 and up....not cheap though at ISO 50...
University of Toronto Formula SAE Alumni 2003-2007
Formula Student Championship 2003, 2005, 2006
www.fsae.utoronto.ca