I bought a cheaper one (Yaber YR800) in a pinch on Amazon for my daughter to keep in her car, but she just left it in the house, which was good luck when her boyfriends car had a flat battery, I took it out to them, and obviously had no issues on a tiny VW Up.. but I kept it in my car for a while and when our US truck loving guy in work had a flat battery in his 5.7L Hemi v8 Dodge RAM (wholly inappropriate for the UK!) he was asking around for anyone with jump leads of a power pack, and two of us helped out, a NOCO Boost GB40, and this cheaper Yaber YR800..
The Noco tried to turn it over, but just kept cutting out.., so I was a bit reluctant to even try the YR800, but it worked! amazing really, how anything that small can get the current needed is almost physics defying..
Seems OK for £80.. definitely would say that any decent pack is worth the money..
I would definitely over spec it though, if you read reviews, the most negative ones tend to be people using them on vehicles closer to the top end of their claims..
I gave the YR800 to be daughters boyfriend to keep in his car now, but looking at the larger Noco Boost, the lack of proper display and other features means I might take a punt on the Yaber YA60, it's USB C, has PD charging, and DC output, so might offer some flexibility..