experiences with the re-running DW importer?

[ratcreature]

So I've imported my LJ to DW in 2009 and consistently crossposted from DW since, so if I rerun it now, and only import comments, will that work out like you'd want it to? I.e. I get a backup of all the newer comments on the LJ entries added to my DW entries, but older comments won't be duplicated?

Comments

[ratcreature]

On the support board I've seen post at least one other post about a recent import with the same problem, i.e. duplicates of some entries after import, also some explained by edits and such, but not all. So it's not just me. Maybe they can pin down what causes this, so people can be forewarned in the FAQ or maybe this problem avoided.