I hired one of these for a day, and liked it so much I went out and bought one from Amazon.
It looks small and - if I'm honest - feels a bit flimsy, but my word does it do its job well! It throws up amazing volumes of thatch. It's really staggering how thoroughly it scarifies your lawn. It throws the rubbish into the basket at the front very well (this fills up too fast, but I can't find a scarifier that doesn't have this problem).
In my opinion, the function you get for the price is amazing.