I meant to say StartSSL, which is the free SSL certificate provider. As far as I'm aware, their free certificated come with no warranty of any kind (although I could be wrong). Depending on how large your business is, you would more than likely go with a trusted brand such as VariSign/GeoTrust/Thawte.
Although for small projects, they're more than fine if all you care about is quickly and cheaply securing transmissions.
Do customers really care about the name brand or "warranty" of the SSL certificate? What percentage of customers are even aware of who issued your certificate, and do those customers really have concerns about StartCom?
This sounds like the argument we heard from DynDNS salespeople last year, about how our customers expect us to be using "enterprise" vendors, rather than "consumer-grade" vendors like Amazon Web Services. Even our savviest customers have never asked us who our DNS provider was.