I switched to SFS a long time ago on my Internet partition, especially when using YAM. I discovered that folders with a LOT of emails indexed MUCH faster with SFS than FFS. Also, when downloading large (hundreds of megabytes) files several at a time, SFS performs hellabetter than FFS.
Right now, boot partitions on all of my systems are FFS. I'm considering changing that on the 1200 with the 4GB CF just to see if there's a noticible difference.
Quick question for other SFS users: is there any issue with allowing the dostype to stay CFS/01 versus changing it to SFS/01? I have forgotten that part in two recent setups.