I got the Nexus 7 for my daughter. Screen spontaneously shattered after 3 weeks (hairline cracks to upper left screen despite being kept in rigid case). Having looked online, there seems to be alot of reported incidences, linked to screen overheating or similar flaw.
Think I might have to bite the bullet and replace it with a mini ipad after all.
My daughters had no issues with hers, it really is a great tablet, but I would still recommend the Momo20 for those looking for a larger screened cheaper, but brilliant specification alternative, best to buy from a UK based seller though.