Hi, I own a Canon LIDE 210 and it didn't work well (first it worked more or less, some months ago it became mostly unusable) with Jessie (libsane 1.0.25), but today I updated to the latest version from git (1.0.26) and now it works quite well!
On ubuntu launchpad I found the same observation: https://bugs.launchpad.net/ubuntu/+source/sane-backends/+bug/1184699 Of course it would be great to get the required changes into Jessie... (see launchpad bug report for details). Thank you for your effort! Best, Bernd