I bought the locking tank and locking anti air, and after playing both, the grounder is far better IMO. For 2 reasons, 1. You can lock on to aircraft! 2.You can still use it as a anti tank weapon!! So if your used to the default anti tank rocket launcher, you will have a anti air weapon tooo. As a matter of fact, I think it shoots straighter AND farther than the default anti tank. I played the locking tank and its not that great. If the tanks moving youll probably hit a dune or structure with the locking. It works good with the tanks at a standstill,but hey, soo does the regular anti tank. Just my 2 cents heavy anti armor weapons.
Already done on day 1 sir. your right it does have very small drop and the projectile is fast when dumbfiring. You can easily snipe things.