Advantages of undivided units

[PFrancis]

When is it an advantage to let your unit undivided. Most articles I read suggest that we should divide most units for better terrain coverage, to alternate in the front line etc. There was even an article describing how to use divide/combine to decrease interdiction effects.
The manual says that divided units have 80% the proficiency of undivided ones and that formations with lot of divided units are more prone to quality check failure. Has this a significant impact? When should I keep my units together? Do you even use the division in 2? I think that units will have 80% the proficiency be it division in 2 or 3, or isn't it?

[sPzAbt653]

It sounds like you have everything properly figured out. I only divide when it is necessary to cover an area that cannot be covered by undivided units.

[morganbj]

I sometimes split units to completely surround a hex, too. But, other than to cover more area, or to surround a unit, I never do it.

[Andriko]

I only like to divide recon units for max coverage, otherwise I will try to avoid it at all costs - they become far to weak, especially if your opponent does not follow suit.

[PFrancis]

Thanks guys. I think I'm reading the wrong articles then. The biggest difficulty is to know which ones are still up to date and which aren't, once, I supposed, there must have been a lot of chances since the first version of the game.

[Hyding]

I think the wisdom of dividing units or not often has more to do with the scenario and the situation than the mechanics of the games.