I have added a compression addin to the vbulletin software that reports an estimated 5% per page compression factor.
The stats are displayed in the page footer for each page and should give us many benefits. Less bandwidth usage and faster load times. Most pages are saving 5% and I have not spotted any difference in the page layouts. Please be aware though that some layouts may change. If you do spot a change and it is considered a negative change then please post here and I will report back to the plugin coder.
DT.