Magmi tutorials & Disadvnatages of magmi

when i searched in google, i found lot of magmi documentation.

but I want to know best documentation for magmi , so i can save my time.

also what and all disadvantages of uploading products through magmi.

please help me to get some links & tutorials

Thanks

You can find all magmi settings and tutorials here

http://wiki.magmi.org/index.php?title=Main_Page

Advantage of Magmi:

• It provides decent speed compared to Dataflow (depending on server config & number of attributes, 70-100 rows/sec is standard magmi speed).
• It supports Dataflow export CSVs file & also some enhanced CSV syntax for dealing with custom options import & media gallery import.
• it works for multistore
• It supports remote image urls for image related attributes (in this case, speed is affected by image download)
• It also provides Generic SQL Datasource Plugin that enable getting data to be imported into magento from another legacy database
  instead of CSV.
• Can handle configurables (through configurables plugin)
• Can handle related, upsell & cross-sell (using Relater &
  upsell/cross-sell plugin)

Disadvantage of Magmi:

• cannot handle downloable nor bundled product types yet