Just for clarity (and management of expectations) - The GBU-39, which makes up the explosive portion of the GLSBD, has just 200lbs of explosive mass so, whilst it's double the amount in a typical HIMARS/M270 M31 variant rocket, it's very, very small for an aircraft dropped bomb (1/2 the size of the smallest current US/UK dropped bombs) so these won't be used to pound open front line defences as the warhead is just too small to have any decent effect on mass trenches etc when the amount that can be fired is tiny. Thats the artilleries job, to pound thousands of shells into fortifications day after day i.e just four 155mm Artillery rounds, of which there are literally millions, has the same explosive impact as a single GLSBD of which there are a tiny number.
Instead, just like HIMARS/M270, I think it'll be used for strikes on HQ's, supplies, ammo dumps, vehicle parks etc, but I think their success will heavily depend on how well Russia has adapted post-HIMAR/M270 introduction, as we saw good effects from these weapons when they were new and unknown but now we see very little as Russia "seems" to be getting a grip of its military, Darwinism in a war does accelerate that learning process very quickly.
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