IIsi was my first self-owned one so I largely started on 7. I discovered 6 from using a PB100 which could fit 6 and Word 4.5 in a RAMdisk persisted through restarts by the PB100's pseudostatic RAM. 6 for me at the time was the modern day equivalent of a distraction-free writing environment. Similar to using an iPad of a couple years ago in terms of how silent and instantly receptive it was to my inputs.