There's 5 levels of reflowable zoom for PDF and ePub in the new ECO Reader, the Australian version of the HanLin V3.
See attached photos (thank you, nrapallo, for this beautiful ePub version of Moonport). My photos don't do this justice - the text is crisp and clear.
Adobe DE (PDF and ePub) and Mobipocket (without DRM) are supported, along with all the usual formats for HanLin V3s.
http://www.centralbookservices.com.au
I'm affiliated with CBS and we're in Melbourne.