Were there any thoughts on TCPDF support?
It is somewhat more widely used and better supported and it has Unicode support.
Today I stumbled upon problem with encoding ’ in our html. Default (and so 20th century) ISO-8859-1 does not support it (so PHP does not encode it - http://bugs.php.net/bug.php?id=42023 ) and I switched to cp1252. But if some wider internationalization will be needed it would be very problematic without Unicode support.
P.S. TCPDF also supports html input but options are more limited than with html2pdf