Have ordered a couple things from TigerDirect before and had no issues with payment, product quality, etc. They didn't fail so I can't tell you how their customer service is, sorry!
I know this is a long shot, but if you want something from TigerDirect and you happen to be a AAA (auto club) member, you can earn a small portion of your purchase price back in "AAA Dollars" applied towards your membership fee. It's not a dealbreaker but if you happen to be buying $1000 in components and getting 5% back you're about paying for your membership~