Bitreserve is a company that sucks money OUT of BTC. If you buy a bitreserve IOU, they have to dump the bitcoins to hedge.

If you want pegged assets that aren't IOU's and don't hurt the crypto ecosystem, buy bitassets:

http://bitsharesblocks.com/assets/market

They are collateralized by the underlying cryptocurrency themselves, and will help grow bitcoin and the entire crypto ecosystem.