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CHNEAL
I have experience with airsoft for training and in watching videos for cool fire I think it would suffer some of the same issues.
1. Recoil is so mild that it’s not helpful for recoil control practice.
2. Recoil is proportional to the waning gas charge.
3. Refilling gas wastes time that could be spent training.
With red dots on your guns I don’t think it’s worth the money.
I would recommend the Glock Store reset trigger instead.
The exception being if you wanted to practice specific things like index shooting without using sights. But a Glock store trigger plus laser bullet would work as well and have more applicability to other things.
If you had zero ability to live fire then I guess maybe cool fire would have more use.