On a cash basis, Tower rooms run around £75 more per night than the base level (Double Hilton Guest Room, bookable for 70,000 points), so for an extra 37,000 points I was getting approx. $112 in value. That's a .3CPP, or pretty much exactly what I think Hilton points are worth. So, not a bad deal, but not a great one. Today I was checking up on my reservations and comparing them to the rates currently available. For the same night, I saw this:
Same room, same night, 34,000 points less! You can be sure I made a new booking and cancelled my old one. Now, for a 3,441 point premium, I'm getting the same £75 of value. That means I'm now getting a fantastic 3.25 CPP return on those additional points!
FWIW, the Paddington seems to be having a bit of a sale on some premium rooms. The Double Executive Room (two categories up from the base room) currently costs fewer points than a base level room:
And that's for a room that also includes lounge access. Not a bad deal at all!