I've seen following message in console, and according to it post information that this scanner (Plustek Optic Slim 2400+) works. One disadvantage I see it's missing option of 2400 dpi scan in xsane (I assume it should work, from name of scanner).
I have installed it about one year ago, in order to make it working I copied firmware from Windows installation into Sane directory (what I has found on some forum, if I remeber well). [gt68xx] WARNING: You have manually added the ids of your scanner [gt68xx] to gt68xx.conf. Please use an appropriate override [gt68xx] for your scanner. Use extreme care and switch off [gt68xx] the scanner immediately if you hear unusual noise. [gt68xx] Please report any success to [gt68xx] sane-devel at lists.alioth.debian.org. Please provide as many [gt68xx] details as possible, e.g. the exact name of your [gt68xx] scanner, ids, settings etc. Kind regards, Rados?aw Smogura