[quote=GreivousKhan]
A full suit is no heavier then modern day war gear. Remember, the weight is well distributed.
[/quote]
Last I hear they're what, 40 kg? 

[quote=LeeRoy]
Wikipedia: "It is a common misconception that the plate armour of European soldiers adversely affected mobility in a significant manner, but in fact plate armour was less heavy and featured more even weight distribution than a full complement of a modern firefighter's gear" Also, they usually only weighed 30-40 lbs. And that's all over your body. That's not heavy at all.Fun Fact: Paper armor is a thing.
[/quote]

But you're still 20 kg heavier than what you're usually move around with.
Besides, 20kg is sort of heavy (for me)
Also, I sort of think that agility =/=mobility.