I try to put them in my combo for a while
Bad Part:
1. Very expensive, they cost 300+ oil and easily got killed by silo's AoE, it will be more useful if lower the cost to around 150 oil
2. Long training time, it take 5m30s to retrain, with its casualty rate, I hope the training time could be 2m30s, same as machine gun
Good Part
1. Very good DPS, I surprisingly find that, it is really really good in breaching wall and bring down building
2. Nice HP, able to survive from one hit of silo
General speaking, they are nice unit but its cost stop me to put them into combo.
I still looking for below buff
Increase Range 3 ->4 in order to increase their chance of survival
reduce cost and training time by 50%