A quick google and the Nordic Pocket Saw can be had for less than £40
(I’ll admit I hadn’t searched off eBay)
The longer version seems to be £60, and key thing is that doesn’t change the question. I’ve found reviews of the Nordic saw but none that compare more than one version – so are the more expensive saws better than the cheap ones.
I’ve bought a 48″ paracord handled one for £14.
I already carry a Bahco Laplander. At 200mm (ish) it’s a bit shorter than the SW75 but then it’s also about half the price. It’s makes light work of surprisingly large branches but you won’t get through the trunk of a fallen tree with it.
It looks like ‘genuine’ Nordic saw has more teeth per inch on it than the cheap ones but you need a reasonably long chain to deal with a trunk rather than branches