Enable VSIX installer for all editions of Visual Studio

Hi,

I have created a text editing extension for Visual Studio 2012.

I have left the default options in the VSIX manifest and in the installation targets there is:

Microsoft.VisualStudio.Pro - 11.0

Some users have said that they couldn't install the extension on the Express editions.

Since all the extension does it text editing I assume it should work in any edition. What is the best way to enable that? I can see 2 options:

1. List all the product identifiers that are available, along with the version (11.0)
2. Only set the identifier to the "lowest specs" edition (I assume that would be Microsoft.VisualStudio.IntegratedShell), also assuming that this would enable the installation on any edition on top of that

What is the best option?

Also, for my knowledge, can someone confirm the assumption that setting the product identifier to Microsoft.VisualStudio.Pro would also allow installation on Premium and Ultimate?

Thanks a lot