Yes i faced a claim early on ...
had to fight it for 3 months before getting it in my favor (they give sellers 3 / 7 days to respond, however if the buyer doesent respond they give them 7 days / 21 days and on and on)
Had to fax silly documentation over 6 times ....
I feel the claims needs to be handled like baazee style (an Indian executive calling both parties and mediating)... the results will be much better.
Its easy for buyers to make silly claims on email and also sellers to wash their hands in similar fashion over email.
Hope things will improve..
(I haven't faced any of these recently in the last 8 months, so not sure if the process has been improved)
TechiE