I have had better luck with fish online rather than fish from LFS. Most I have gotten usually come with a guarantee like this place does and I have never had to use it. There are very few LFS that have any guarantee on their fish, espicaly not 6 days! Now, If I were a business, and had employees who knew what they were doing, had healthy stock, and was sure of customer happiness I would not hesitate to give a guarantee... so, why do most LFS not give one but online retailers do? Simple, better quality livestock, less stress from going to so many tanks before yours and just plain ol' better care.
Just my experience here....