I've tried most of these eReaders and I've only found the moon+ satisfactory. On my tablet I have to use a kludge to select text but I think it will be solved in a prox. update. Otherwise the reader works really well for me - I really like the themes and the controls. There is a dict facility and possibility to comment etc on the text. This is a must for me.
Aldiko - the latest version - is ok for reading but no text selection or dics.
Fbreader I've found pretty useless - it always seems to crash.
Laputa I couldn't get to work at all.
Cool is second best but it has problems on table of contents and no possibility to comment and note up.
AEP and i readers between them more or less manage .prc files.
Repligo reader from cerience works well for pdf and has mark up
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