If I may, I would also like to add to #3 above.
I would request that we all please stick to the facts of how the transaction progressed, especially when reporting negative feedback. Please avoid unecessary inflammatory statements and name-calling, and instead try to qualify why you feel disappointed by your dealings with the vendor. This gives the vendor a chance to rectify the situation for future customers, avoids unecessary flaring of tempers, and makes it easier for others to make an informed decision regarding their intended purchases.
In the case of positive feedback, it's especially valuable if you can cite a reason that the vendor under discussion stood out from the crowd.
Thanks!
-Pace