I used to be an all tabs guy(sw=4, ts=4). Then I got hooked on Python and it was easier to go with the spaces only. Have configured my .exrc so that tabs get mapped to spaces (4 / tabstop). I don't even think of it any more. All my old C sources have morphed into spaces only as a result. Hey, disks have become huge and text compression is pretty efficient so I don't lose sleep over it anymore.