Disadvantages of ActiveX for Web?

I am developing an user control ActiveX component to be used with HTML. This is an .ocx file to run on server.
Are there any disadvantages of using VB6 to develop this component.

Using VB6 is fine.. but ActiveX components on the web usually arent - as these days very few people allow them, that's even if their browser supports them.

If you are looking to have lots of users (or ones that arent in your company), it is a good idea to avoid ActiveX components if possible.