I've used Wasabi batteries and chargers for my Nikon DSLRs for going on 5 years now, and have never had a problem. I've never found any difference between them and the Nikon batteries.
The Canon P&S in the house has used the Canon versions with no problems, same for the Canon XA10 camcorder, and although I haven't needed to swap batteries yet, I have every confidence in the Wasabi setup I got for the new Sony RX100.
The Wasabi chargers I have all include 12V adapters so I can charge in the car if I need to. For me, this is a huge plus.
I'm sure there are crappy 3rd party batteries out there, and crappy chargers as well. But based on my experience, Wasabi products are excellent.