actual experience:
They are good when they are good.
In baked hard clay, just the ticket.
In gravelly stony ground, just as crap as everything else, and a screwing motion doesnt deflect pebbles and rocks to the side like hammering can. I bought 40 to put our big tent up with, but abandoned them because the pitch has been graded and was hardcore below 20mm.
I bought these of Amazon, but they are actually cheaper in Go Outdoors in the end.
https://www.gooutdoors.co.uk/15904939/hi-gear-screw-tent-pegs-hexagonal-head-15904939
i did look at buying some long screws and washers from screwfix, but by the time you get up to a decnt length, theyre actually quie expensive and dont come with the neat nylon retainer hook., or the driver bit.
i think it can reccomend them, but im not sure i would reccomend them if they are your only option.
Good to have in the van, with the other pegs.