ISU-122S

"A heavy assault gun, built on the basis of the IS tank, was effective against German heavy tanks as well as fortifications. The prototype was built at the Chelyabinsk Kirov Plant in April 1944. The vehicle entered service in August of that year, and a total of 675 vehicles were manufactured in 1944 and 1945. This Premium vehicle has a 20% bonus XP earn and a 35% bonus Silver earn." The ISU-122S is a Soviet tier 7 tank destroyer.

Pros

 * Amazing DPM, among the best in the game.
 * Fairly good gun stats for a 122mm gun.
 * Good camouflage values.
 * Good top speed, fast in a straight line.

Cons

 * Only the gun mantlet is decently armored, but it is easier to penetrate than on the ISU-152.
 * Low muzzle velocity and poor accuracy for a TD gun.
 * Narrow gun traverse.
 * Turns sluggishly, very vulnerable if flanked.
 * Penetration is unimpressive for a tank destroyer.

Equipped with a quick-firing variant of the 122 mm D-25 gun seen on the IS and IS-2, the ISU-122S can be a terror on the battlefield. With a fantastic rate of fire of 8.11 rounds per minute, the ISU-22S fires almost twice as fast as the IS tanks. The fantastic rate of fire of the gun allows the ISU-122S to potentially rip apart any same tier vehicle in less than half a minute of sustained fire while casually blowing up any lesser tanks. The ISU-122S can drill through the enemy team with impunity.

However, the ISU-122S is far from perfect. The armor is inadequate for a tier 7 vehicle and most same tier tanks can penetrate it with ease from any direction. It is also a large target with a 30mm roof, leaving it an easy target for artillery which can wreak havoc on its low 870 hit point pool. The lack of turret accompanied by a mediocre traverse both in hull and gun leave it vulnerable to flanking maneuvers. The layout of the vehicle also causes it to take module damage quite often. The gun takes about half of the hull and is often damaged, while other shots can easily kill the gunner. These two can be highly irritating due to the low accuracy of 0.41.

In tier 8 and 9 matches that the ISU-122S faces, the D-25 isn't nearly as scary as before, forcing you to play much more cautiously. Less than ideal accuracy coupled with 175 mm of penetration will make it difficult to hit weak spots when required. However you still have your massive damage per minute, turning flanking shots and thinly armored targets into smoking wrecks.