Thank you for the input I just have never bought any of their batteries and we all know what they cost so just cautious? better safe then sorry.

GB batteries are very good batteries and sure i would buy one. As far as how good they are? If they are taken care of, charged regularly and kept clean they should last many years.
As for their warranty? it's on their website. gbbattery.com
look on the left column part way down in the 'downloads' menu, you'll see 'warranty statement', that will link you to their warranty statement in detail.
From the looks of it there is a standard 5yr warranty on all of their industrial batteries plus an extra 2yr conditional. hence their header saying GB5 +2.

They are made by Battery Builders BBI and are good quality batteries. I am not sure how their warranties are handled other than by a local rep.