I've used the point every time I CO on TG. It is an irreplacable asset for the Commander... between this and the UAV I'd always use the CO rally.
Coming away from an organized event on Shijia Valley in TG I used the CO rally three times to keep a constant flow of troops into battle so that effectively we never stopped. While it wasn't the reason we won it surely aided in the defeat of Fuzzhead

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No honestly it really rapes FOs when attempting attack runs and is incredibly easy to place even when attempting to reinforce an area. It only takes 6 people to set it and two Squad Leaders around... To get around this I normally attach an APC/IFV with a 5 man infantry squad this allows a spot for myself in it too and once we drop off pop goes the rally and the attack now has theoretically the entire team at its disposal.
The biggest thing I dislike about the point is its ease of destruction by any enemy presence within 100m. This is terrible when a helo flys by and doesn't even notice your position. I love the point it allows a wonderful easy way to get troops into the battle and focus your entire army... nothing beats it on the attack.