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I've got the one that has the key which I think may be a bit thinner and lighter compared to the one you've posted there. Took it with me on TCR a couple of years ago and never used it once but it was good to have just in case.
Pretty unlikely but if your bike is going to get stolen it's probably more likely to be in the UK compared to pretty much anywhere else. Like @skinny I pretty much always bring the bike inside and in some cases will actually just wheel the bike around with me if the supermarket is massive and I can't see it clearly. In my experience people rarely question it and also never ask anyone for permission because you'll inevitably make it 'a thing'.
Thanks for replies
Do you mean this hip lok
Looks like a good balance of light weight and deterent.
Helps I have a cheap bike!