My very first C64 emulator barely worked. To this day, I can't say who wrote it. It may have been a very very early version of C64S. Downloaded off a local BBS in 1992 or so? Along with a few d64 files to test it out. My PC wasn't fast enough, but that emulator was also completely raw and unoptimised. Later in the mid 90s I used C64S a lot. All the way. It had a competent file browser, a few good options, floppy drive emulation kinda okayish, and it transformed my 286/386/486 into a cute little Commodore 64.
PS: I remember that I've also downloaded a C64 "emulator" before that, when there were still these Shareware/Freeware download disk stations all across the computer stores in the city. You would pay a flat fee of 3 german marks, and you'd be given a DD 3,5 inch floppy disk. There was a computer with thousands upon thousands of games and other software on it, shaped like some kind of booth or arcade machine, in which would then you insert the floppy, and you can copy as much as you can fit on there, from whatever was stored in the computer. There was a fake C64 emulator that I copied. It animated the blue BASIC screen with cursor, but every time you would enter something, it would just say SYNTAX ERROR.
Boy I am off topic. Sorry. Ramblings.