We use Members' Cash to book at HHI lots of times. That's partially because when we go in November, the MC price is about $125/night for a 1 BR and only about $90/night for a studio. Compare that with the "cost" of weekend points, and at that time, cash is the way to go. We mix cash nights and member's cash nights, and the stay is seemless-we can't tell when we're there which were the cash nights and which were the points nights. In the summertime, when cash and points are both significantly higher, the best way to go might be different.