Interesting. Really have such things.
5k potentially deduct > 15 seconds off for this (in sub-20 territory, above eg 32 mins for 260W cycling not full gas effort is well in advanced "sportive recreational" rider territory) and just some room temperature water (you can upgrade to iced water + towel to soak up). I'd say just for $60 that you can use over and over again for a few good years, it is a good deal, much better deal than shoes actually.
Heck - so many already willing to throw a few thousand dollars going to overseas race with good weather - for that only 1 single shot at PB and if that day is a bad day ie your stomach no good and/or sleep previous few nights screwed up coz stress, gg already. Few thousand bucks 1 single shot going for 1 shot 1 kill.
But cant bring to 5k parkruns or 10k races i guess. Many "normal" people will laugh and say keesiao. But i think for own TT is good.
So depends on your own mentality.
Of coz it is not going to change you from a 22min 5k runner into a 20min 5k runner even here in hot Singapore with high heat index temps, no way.
But when you are already more or less plateaued and can only fit that much training that much recovery that much discipline in nutrition for diet and supplementation and that much acceptance to good coaching advice you receive, every other last single bit helps.
Have 2 versions. 1 is older type, one is new design. Both used by pro teams.
edit - already carted out the cheaper version. At least less messy than pouring iced water during warm up (and potentially dripping onto the quads, calves and glutes) and cooling the important leg muscles.
Esp for me since i am already used to using active cooling tricks.
Also good for TTs on WCH.
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