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I like mine and just drank a cup of it in fact.
The included instructions call for 50g of coffee and it makes about two mugs so I don't dilute it. That's only a tiny bit more than normal (hot) coffee to water ratio. Haven't noticed any jitters and other signs of too much caffeine. but then I do drink a lot of coffee at the moment...
You could obviously use a more traditional (stronger) cold brew recipe but this works fine for me
The one mentioned further up this page (edit - now the last page), although I mostly see the larger size in the top middle for sale:
https://www.hario.co.uk/coffee/cold-brew.html
The bottle one actually looks nicer in terms of something sitting on a kitchen counter but might have to go for the smaller jug to control my intake. Does it need diluting a lot once it's finished?