Has anyone acquired / had a go with one of these-type things?

https://tinyurl.com/yaluraxv

(That's a 232-character URL at Amazon, reduced by TinyURL.)


Background: we have a small woodstove, connected to a traditional 60s
semi's fireplace, chimney pronounced fit for use by the stove fitter,
i.e. no stove liner.

Cheers
John