Been using it online for a year and no issues.
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I Have Been Online WIth My OLD PSN Acc Since day One .. i had no issues at all with Vita .....................my hacked PS3 was another story ..lol
You Should Be Fine
Yes it would i do it all the time ..i have 2 vita's Slim & OLED & a PSTV ..... All Online ALL The Time especially with my kids playing Minecraft Non Stop ....does that include opening homebrew while signed in?