Looks like at least the Wi-Fi version has 2 really bad issues and apparently the solution from Sony to fix one issue can cause the 2nd issue to occur. I'd assume not too many people bought the 3G version since no news on if these same problems plague that one as well.
Quote:
While Wi-Fi connection has been reported to be a bit iffy, it's not yet sure if this is a widespread problem or just due to network configuration. One of the most widespread issues however was that the system would occasionally freeze, either when installing an update or playing specific games. Sony has already addressed this problem and recommends affected users to turn off their systems by holding down the power button for up to 20 seconds, as a normal shutdown is not possible in this case.
But Japanese gamers slowly find themselves asking if they should turn off their systems at all, because now another problem has reared its ugly head: Users have reported that they weren't able to turn on their Vitas anymore. This issue seems to be spreading like wildfire over Japanese support forums and Sony has not yet commented on it. It is of course entirely possible that this is merely due to user error, but the numbers of affected customers seems to be on the rise. We'll have to wait and see if Sony will address this issue as well and how widespread it really is.
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http://www.screwattack.com/news/psvi...r-major-issues
Also unlike the PSP's launch, the Vita hasn't sold out in stores with plenty of handhelds still on shelves which is what Sony hopped wouldn't occur (one of their worst case scenarios).