In reply to TryfAndy:
Hi.
All I know is from the Polish forums, no direct experience.
As you rightly say, apart from making rucksacks for trekkers etc, they make models for the army. All of the opinions I heard are that the rucksacks are well made and very robust. Downsides would probably be weight and relatively simple design (for me it's a downside, but for many people it's an advantage)
I think you can expect a solid product that will last years, will be relatively comfortable and should not cost you a lot.
If you let me know the specific model name, I can look for some info on the Polish forums.
Note: most of the people say that the capacity in liters seems to be always less than other producers with the same number. So might be good to see the rucksack to see if the size is right for you
Cheers
RS