What's amazing is we have sent only 20, and they've had such an effect, even without the longer range missiles.
Last I heard (which admittedly was over a month ago) the Russians had failed to destroy any HIMARS in Ukraine, despite claiming to have destroyed many more than we even sent.
They’ve been used to good effect, yes, but the Ukies need a lot more* AND the ATACMS.
*Even that over-optimist Ben Hodges was saying 60 or 80 HIMARS some months ago. Then get other operators to make it an even 100 or have them send some of the larger GMLRS compatible with ATACMS. (Not as mobile, but can hang further back.)