I purchased my first baby CB Ball Python from them, and it died a month or so after arriving. I doubt it had anything to do with them per se, as it mangled itself somehow while I was out of town for a weekend. I've heard people having good purchases with healthy animals, though.
They're decent as far as supplies, as they're the cheapest around for incubators and the like. But I usually do most of my business for supplies with herpsupplies.com instead. More selection it seems.
But for quality animals I would chose a private breeder over a petstore in a heartbeat. LLL doesn't produce most of their snakes, so goodness knows where it comes from or what it may have. Plus, as with all petstores, they charge a premium for some morphs you can find cheaper by buying privately.
So I guess its up to you, really. =)