If it only plays at potato quality go to youtube and watch.
There is the hull compared to its countpart. The tracks look a lot beefier (better) and the head lamps built in the track guards are great. The sides are nice, solid sections. One bonus to this kit for me is that if I want to add side skirts there is plenty of room to do so. Same with adding sponsons if I decide I want to waste points :/
You can see here how the turret is also quite a bit beefier. I've got the long barrel canon out to compare since I have my assembled Leman Russ with a Vanquisher cannon. The barrel is nice and long like the Forge World offering. The last picture is the twin autocannons to count as the Exterminator. I plan on using magnets to be able to mount all five options included with my Gideon.
...I haven't gotten a tank from Forge World in some time but I don't remember any of them being this clean.
Cheers!
CJ