In order to get cloudfront to deliver gzipped content I've had to change from gzip_http_version 1.1 to 1.0, and manually
add_header Vary Accept-Encoding to the relevant sites.

What I'm wondering is how this will affect the sites involved - is gzip_http_version 1.1 faster / slower than 1.0, or are there any other hidden gotchas??

Cheers,

Steve