I've bought several testers both from ebay & scentiments.com and have absolutely no problems with the frags. I think testers are an inexpensive way to go!!! As always, though, when buying on ebay be sure to check seller's feedback & read the description of the item VERY carefully!
Agreed - I never had a problem with testers, some reputable ebay sellers are meidy/allshewants and scented monkey (which also has a standalone web site). Check the description to see if a cap is included or not.