Solar as battery maintenance during storage - opinions

Coleman/Sunforce offer a 7a controller with a 13v cut in, and a 14.2v cutoff, for only $17, at Home Depot, and ~$18 at Radio Shack. And a similar 8.5a controller at Can. Tire, for $22. Cheap piece of mind, perhaps?

http://www.homedepot.com/p/Sunforce-7-Amp-Solar-Charge-Controller-60012/202218721

http://www.homedepot.ca/product/7-amp-solar-charge-controller/986482

http://www.radioshack.com/sunforce-60012-7-amp-charge-controller/2770107.html#.VI9JWsmVHkc

http://www.canadiantire.ca/en/home/energy-production-storage/solar-energy-converters/coleman-8-5-amp-12-volt-solar-charge-controller-0112008p.html?utm_campaign=bazaarvoice&utm_medium=SearchVoice&utm_source=RatingsAndReviews&utm_content=Default