I know it is recommended to telinit 1 for upgrades...and if you are using pkgtools, then this is generally a good idea. I have been running slack-current for awhile now, and using swaret, I've upgraded each and every package with no problems whatsoever. Some packages I've upgraded while X is running, but some of the more critical packages, I upgraded from the console. So, if it works fine for you, then why not? If you have problems, then the choice is obvious.
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