We recommend against doing so, mainly because of the poor transfer ratios. (valuepenguin.com)
While airline programs partner with hotels and vice versa, in most cases it's not worth transferring out due to poor transfer ratios; the main exception is Starwood Preferred Guest, which enables you to transfer to a number of airline programs with a 25 % bonus if you transfer in increments of 20,000 points. (getrichslowly.org)
You can also transfer these points to Delta and SPG, among others (though the latter is not recommended due to the poor transfer ratio). (travelcodex.com)