i think sets are quite unworthy in that game compared to RPGs like Diablo (i know kings bounty is a different genre but still they could have reward you with better bonusses for collecting all the items). and using sets you are really bound to that combination and cant mix. thats a pain. so i better go without and you really find better items later in the game.

I have the following set:

Telescope: Multiply X2 Attak of archers using device ( such as Bowmen, Cannonneers, Catapult..)

Barrel of Dwarven Ale - +1 morale of Dwarves

Bonus set: +30% chances of critical hit for archers.

This is pretty good for an Army of Archers

This is so overpowered. I wish i had that set.

Sadly I had that set but couldn't use it because by the time I obtained it my current (and last wife) could not equip the item (i.e, i had no method to equip both the barrel and telescope :(