I bought the DataSprings collection a week or so ago and it has really helped with a migration from an old (non DNN) website to a DNN based one.
Especially the 'Interactive User Import' - after cleansing the source data (from the old website), I manged to get 6817 records imported in just a few minutes.
NOTE: I did have to edit the install sql scripts to add 'CreatedByUser' to the AddSchedule sproc calls - but that may be 'cos I'm using 5.1.1
Excellent products - thanks !!