Bought the IS tank today in World of Tanks for 1,424,000 credits.
"The IS is a Soviet tier 7 heavy tank.
The IS ("Iosef Stalin"), with its 122 mm gun, was an unpleasant surprise for the Wehrmacht. Produced from October 1943 through June 1945, with a total of 107 of the IS-1 vehicles and 3,483 of the IS-2 version manufactured.
It is the first of the Iosef Stalin class tanks available to the player. The IS represents both the IS-2 and the early model IS-1. The IS can be researched from the KV-1S or from the KV-13, which is sometimes is used as an easy grind bridge. The stock tank is the IS-1, equipped with the 85mm gun also available on the KV-1S. The IS is a continuation of the KV-1S and will thus feel very similar in terms of agility and speed. When equipped with a 122mm gun, it technically becomes an IS-2, which will feel much more potent when engaging other heavies. Like most Soviet heavy tanks, the IS fares much better engaging enemies at close range where the IS can hug cover and back off when it is reloading. Thus, the IS is better for maps such as Himmelsdorf where there are mostly close-quarters fighting and no big open areas. The frontal armor on the IS is decent enough to bounce a lot of shots from lower tiers and is surprisingly bouncy even towards other tier 7 tanks and higher tier tanks if you angle the tank properly. Play this tank smartly, hit your enemy, pull back to reload and hit your enemy again. You will find yourself doing massive amounts of damage to the enemy and if you play this tank properly, you can really help your team a lot.
The IS leads to the IS-3."