If I had to buy a device solely for reading purpose, I'd go for the sony 505. I do not own the SmartQ so can't comment on it. I used to read on computers (desktop, laptop, netbook) for long hours and felt dizzy, eyes strained, and saw "flying flies" (like when you look at bright light for a few seconds, sth like that...sorry I dont know how to describe it clearly). Maybe I have bad eyes, I dont know
Thats why I bought the sony 505 last year. To me its like reading a real book and no more watery eyes for me!