If you own a Vita, the charging dock is a convenient way to charge the battery. It also functions as a stand, if you watch movies or stream videos on it.
I use it to play games – I throw the Vita on the stand and play – but only turn-based games, nothing fast-paced. I wouldn’t recommend doing this though, so don’t go buying the dock just for that. You might be disappointed.
Either way, it’s pretty cheap at $12. Check it out.