Yeah great against building. This means u can destroy AGT only for 450 (buggy + chem) if u r very lucky and all GDI doing something useless

But something can be done more cleverly :

1- player "A" buy engy (0) and a buggy (300)
2- player "B" buy chem (150)
3- player A & B jump in the buggy
4- together they go to AGT (if the buggy were damaged in the travel, they can do a pause to repair it)
5- the attack : with an engy & a chem => this is definitivly possible. The attack occur very earlier (when cash is at 300 !)and can surprise all the people who stay to fight in the tunnels (on many maps the game start with people fighing in tunnels) !...