Quit Claim Deed

[Casey Kooiman]

Submitted an offer last night for an investment property in Milwaukee (a duplex), and the Seller countered with this:

Conveyance of Title: Upon payment of the purchase price, Seller shall convey the Property by Quit Claim Deed without warranty of title. 

I know this is the weakest of deeds, but I don't know much else about this... Could someone else potentially have claim to the property? How can I protect myself? Why would they request this, and should I not be accepting this counter due to it?

Any advice would be great! Thanks, BP!