Determining what's a good redemption value is a personal thing. Taking a figure from TPG or soliciting opinions from people here can be good guidance, but ultimately you've got to make up your own mind based on personal factors. Among these are how much you can redeem points for given your travel patterns as well as what a particular redemption is worth to you irrespective of its nominal price. See, for example, you opinion that hotel A is more enjoyable than hotel B even though B represents a higher return of cents per point.