https://www.amazon.co.uk/Krups-GVX231-Expert-Burr-Grinder/dp/B0002H2IOM
Is surely better? As its burr, and I'll do espresso too. Though I paid £40 for this 5 years years ago!
The Wilfa is a burr grinder.
Reviews seem pretty mixed from what I've read. My research also gives me the impression only a pretty decent grinder can do fine enough for espresso.
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the volume will vary massively with the extraction, temperature and beans - much better off getting a small £6 jewellery scale and going by weight.