Wildcard Certs are great
We have been using wildcard certificates for a few years and they have been great. We create a lot of test and demo web sites, so having a wildcard cert makes this very easy. I have even used them for some services where they say you can't use them such as Lync. I have used the same wildcard cert on IIS and Apache without any problems, though you need to know how to setup on each system as that is different. We have used them for Exchange and other services as well. Overall I'm very happy with wildcard certificates.