Personally I haven't but have heard a lot of positive comments about them from people on here. I don't know of anyone who lost a fish. I know they offer a guarantee for two Weeks or something. Kind of hard to beat that
I've ordered from them many times, and can say they are one of the best online vendors out there. Especially their Divers Den section. Livestock is always of the best quality, shipping is top notch, and their customer service is second to none. Good luck with your order.
Their stuff is top notch. I have ordered plenty from them over the years and I have never had a problem with any of their stuff. If you buy fish from them you must acclimate them very slowly for the best results. I would buy stuff from them again for sure.