It's a giant medium tank but slower. It has a good gun, though don't expect to bounce anything even off the pike nose. Your only chance of survival is to not get hit at all. In 4 battles I've lost the driver twice, both from frontal penetrating shots.
The gun depression is pretty decent so I'm wondering if it would be good as a hull-down tank. There's 2 little tumors on the turret though, but they seem small and would be difficult for anybody to hit unless they're face hugging you.
The T-110... is not fun. It's a worse KV3, and out of 5 battles I've been set on fire twice. The armor is not strong and you need tracks and turret to mount the 107. Prior to that you a KV with the 122. Similar speed, similar armor. KV-2 was seeing all tier 9s and 10 battles in the morning, so I'm thinking the 152 is going to be more useful than the 107... but it may just be everyone playing with the new tanks in the morning.
The E-75 is superior as a breakthrough tank. I still don't understand why people think the E-75 is bad or isn't as good as the soviet counterparts, the tank is beastly and is leaps and bounds better than the old IS-4 with none of the gaping frontal weaknesses. You really only need to angle the lower glacis a bit and it'll be bouncing things the IS-4 couldn't ever imagined of.
The new IS-4 seems pretty beefy (haven't driven it yet), but I'm wondering if it's just because it has 2400 hp (same as an E-100!!!). Haven't really fought it yet, when I tried circle strafing one my Is8 got shredded by 4 other tanks.
The gun looks cool though, and if you had camo on the IS-4 before it got moved over the IS-8 also gets the camo.