I've used GoDaddy SSL certs without any problem.

Considering they are 1/2 the price of instantssl.com, I'd say they're a fine option–especially if you're bootstrapping.

We've had great success with GoDaddy SSL too. Just because they have a terrible sign up process and UI doesn't mean that their products are terrible.

The problem with godaddy is that they seem to reduce costs very aggressively by automating about 95% of all cases. If you happen to have issues that fall within the remaining 5% you're totally screwed because they simply refuse to help. That's my experience anyway.

Agreed.

I should also mention that they have the lowest wildcard certificate I can find.

A few of my SaaS apps require this because they're subdomain-based. $200 is still a lot for a wildcard cert, but less than $379

why is that?

Because I've had a pretty bad experience with godaddy when it comes to domain names, that burns them as a supplier in my book, possibly they are 'better' when it comes to certificates but once bitten twice shy.