BrowseRank v. PageRank

Search Engine Land posts about Microsoft's new ranking algorithm, BrowseRank, based on user browsing behaviour rather than web links. Whilst it seems reasonable to presume that BrowseRank will produce better results than PageRank, the question is whether people will willingly/knowingly share their browsing data, and if they do, which search engine they would choose to share their data with. Whilst Microsoft may not have been a particularly trusted brand in the past, they do seem to be putting the past behind them.