I'm going to list some auctions on ebay and wanted to know if it is worth it to print out the postage labels using the paypal service. It looks like a time saver as it prints out the to/from address and a postage bar code. No more hand writing and buying stamps.

If you use this service, do you mind a few ???
1) Is there a paypal charge (other than postage) to print Postage Label? If so, how much?
2) What size label do you need and where do you buy these labels?
3) If you use these labels, can you then dump them in the mailbox?
4) What do you not like about using this service?

I tried looking at the paypal site, but it dossn't seem too helpful. Thanks in advance!
Greg