“The White House confirms that the M39 variant of the ATACMS has been provided, but not the 300km range versions.”
https://twitter.com/RALee85/status/1714354921925963902
“US officials secretly approved sending ATACMS (APAM) in the package of aid announced Sept. 21, under the category of cluster munitions. The US administration briefed a number of members of Congress in a classified setting in order to prevent leaks.”
https://twitter.com/NOELreports/status/1714343822845411627
For targets within their range (all of occupied Ukraine, save for parts of Crimea), these shorter range M39A are probably the superior weapon. They carry 950 M74 bomblets vs 300 M74 bomblets in the longer range M39A1.
Still waiting for BDA from Luhansk, which was apparently targeted with 2 missiles.