We got this one, bought in 2011 as you see, it gets a lot of hard work here, we’ve replaced the blade once, you can turn them over but not sharpen them. Will buy another blade this year probably.if you can get a good 2nd hand one it should be ok, no telling with that though, someone may be getting rid because it’s knackered.
We've got a similar looking Bosch shredder as well but maybe a bit older. it has a corkscrew effort inside which crushes the wood? Didn't know you could get replacement blades - is there one inside as well as the corkscrew bit?