If you play Soviets in Bolt Action, you need one of these models. In the game, it's a versatile weapon that can deal with both tanks and soft targets. There are many weapons that do one or the other task better than the ZIS-3, but few can do both (the SU-76 gun is another, basically being a self-propelled version of this gun).
As for the model itself, it's a good representation of the real weapon and the crew are good if not spectacular sculpts. It's a metal kit, with all the extra preparation that requires. No instructions are included, so you will need to find the assembly guide on the Warlord Games website and/or use photo references. One quibble: the kit doesn't come with a base for the gun (mine just had a few infantry bases for the crew). I usually put my light artillery on 60mm round bases, but the ZIS-3 proved too long for that. In the end I bought a large oval Renedra base for it.