Impressive armoured force!
I'm about to start building my Kursk Germans and collections like these are very inspiring.
While most of my Soviets are Zvezda/FoW at the moment (simply due to cost/ease of purchase), I've been really pleased by my PSC kits.
The German and American PSC kits I have are great, but unfortunately I cannot say this for the Soviet ones - especially the T-70 was a big disappointment when it comes to accuracy.
For plastic Soviets, it's better to stick with Zvezda and Battlefront.