I am always skeptical about technical claims that are basically "trust me I used them all the time and never had a problem".
While not necessary the only criteria for capacity (plate design and composition are also factors), battery weight has a lot to do with the capacity You can expect from a battery.
Just use a simple bathroom scale and check the weight of those batteries and see how they compare to name brands.
As far as the reconditioned batteries, it depends on the fine print about exactly what constitutes a warranty claim, the battery may have an adequate "surface charge", but not give You much run time, You need the details on the warranty and who is behind it.
Some batteries are taken out of production early due to poor maintenance, those batteries may be good candidates for equipment like this one from FSIP:
http://www.fsip.biz/BatteryRegenerationXtender.html
On the other hand, if a battery has depleted all its active material, there is no magical solution to revive it.