iPhone 3GS, iPhone 4, Samsung Galaxy SII and iPad 2 I invite no problems with the IP.
So, now to the Vita:
If you directly connect the charging cable of the Vita to the IP, the charging does not work.
Because the IP has been designed for charging with 2A charge current.
After speaking with the very good and competent customer service they gave me the recommendation, the adapter for the Galaxy Tab (reduces the charging current to 1A) to put between.
Behold, the PS Vita can be charged now with the IP.
That works just fine, I have the Vita now charged with the IP there 3 times and he still has enough power for the next load.
Which by the way works very well, is charging while using the Vita.
I can wholeheartedly recommend the Powerpack IP, all devices of mine are charged by the IP without any problems.