Panel is ok. Advertisement to be ignored where it says 16% efficiency and then the spec says 13% :)
Four of those in parallel will be 4 x 6.2a = 25a which is quite a lot for solar, but then you need some margin too. The usual is 20% margin needed so that is another 5 amps for the controller (so you need a 30a controller) and the battery fuse on the pos wire from the controller to the battery (30a fuse)
I have a Solar30 controller that would be perfect for that job. There are many others to choose from. I like the adjustable voltage, the amps readout and the AH readout which you just don't get in similar controllers in this price range:
Prices are all over the map. I paid $34 but this guy has one for $24.
http://www.ebay.ca/itm/New-Version-30A-Solar-Charge-Controller-with-LCD-display-12V-24V-light-and-timer-/141218655262?pt=LH_DefaultDomain_0&hash=item20e149ac1e
