Because I really like the level of customization you provide, but it was very inconsistent for me - sometimes it worked, other times no. At all times, when the plugin was activated, I couldn't render any page in IE 6, 7 or 8 on WinXP - system tried to download the entire page and I received this error:
Windows has the following information about this MIME type. This page will help you find software needed to open your file.
MIME Type: application/vnd.wap.xhtml xml
Windows does not recognize this MIME type.
The Firefox user agent emulator for all versions of IE displayed the mobile theme instead of the normal desktop theme. So I'm puzzled -- this happened to me with plugin versions 3.84 thru 3.91. Problem didn't exist at all on Vista.