Since it doesn't say it includes a stand, light, or the live plants that are in the pictures I wouldn't say it's the best. A visio tank at a LFS
or aqueon brand tank at Petco when they have a sale is $10. Gravel and rocks could be $15 new. Depending on the decorations for a 10 gallon $20. Filter-$20. The fish he has is about $15 maybe a little more. All of that combined, when bought new, is $70. If they were selling for $50 or less then I'd say it was okay. At least where I live, on CG larger aquariums w/ supplies (70 up to 125) are actually less than people selling 30 gallon FW
established tanks. Some people don't realize that used items shouldn't be sold as if they were new retail products.