Mmmmm....if my experience (albeit limited) is anything to go by, I would advise against adding a magnet! I bought my Nexus 7 a few weeks back and all was going very well, no hang ups, crashing etc as have been experienced by some. Then for no reason I could deduce at tyhe time, it began crashing randomly, when moving it, using the volume switch etc. Well this coincided with mt wife picking up a case for the tablet, a Gnarlyfish' folding hardback case into which the tablet fitted nicely and the magnetic catch was just perfect.....or so I thought. I have now discovered that out of the case, after a factory reset, it works perfectly. As soon as I put it in the aforementioned case, the tablet starts randomly crashing once more. Seems 'Nexus' (at least mine) is not into magnets! I did drop a line to Google Service support advising them of this phenomena but have yet to hear from them. As I say, out of the case, the tablet performs flawlessly.....but not in this case. No brainer really now I have sussed it. Having a said that, my son has an Apple Mini pad and he has a case that locks with a magnet and he has had no problems at all! Go figure.