They are offering a really good deal but I am not sure of their reputation. It looks legit but my DH wants me to check into it a bit more.
I suggest spending about $50 or less for a good shredder at an office supply store. There are some cheap shredders and some high end.
I am not a trusting person and I would not leave personal documents for someone else to shred. Might as well put them in the trash can.....
We have a good shredder and it is just one of those jobs I do on occasion when I get my little box of things to shred full.
Good luck.