Rotman Epps of Forrester, a research firm, reckons high prices will prove fatal for these rivals.
Ms Rotman Epps also said that she does not see a lack of apps holding Amazon's tablet back, because most users' tablets are currently used primarily for email and web browsing.
Sarah Epps, an analyst at Forrester Research, said Sony had publicly indicated that the two new devices were part of a new suite of e-reading products it would introduce this year.
