[TrK]

Just out of curiosity, whats wrong with letsencrypt?

Nothing, but is usually better than a WoSign cert. The only reason here is establishing trust with the client, proving that they are serious setting up 'potential money' to add something like that. Or something along those lines.

Yes...we are working on it...two options were in my mind...StartCom or LE...

If you want to get trusted then never use Free SSL on your business domain instead of free use any cheap SSL as free SSLs are not always trusted by all browsers.