Personally I would buy that for around 150-175 (euros?), then again money is tight for me. It is used after all, an overclock should not really be a factor when increasing prices since you could overclock it yourself. However if money is not too much of a factor then you should go for it. In addition, it does not state how long it was used for, if its been used for such a long time I would not say it is worth it. In essence, I do think its quite a good deal, the Phenom 1100t is very rare and if i recall correctly it used to go around for $200 dollars alone. Do you have a computer case that's big enough for that cooler, that sure is one monstrous looking cooler . You are probably buying one of the last few 1100t's on sale, hold it and love it.
I bet you get a good bit more, I sell differently though I like the 24 hour low start auctions, you get a nice bidding frenzy at the end. I found I got pretty much the same prices for items as on longer ones.