I actually stayed at the Westin Taipei just a couple of weeks ago, and it really helped to form the basis for comparison. Both rooms [Sheraton vs. Westin] were suppose to be deluxe rooms at 41 sq. meter, but the Westin was far nicer.
And unlike the Sheraton, Westin Taipei made it clear there would be a 10% tax not included in the rate. It wasn't just Travelocity, it was also Sheraton's own reservation system. In bookings made through Sheraton's own systems, the 10% charge is clear. Booking through Travelocity [Sabre], I was given the impression that the 10% tax was already included in the rate. So there was definitely some miscommunication.
I'm not asking for anything special from either SPG or Sheraton. I just thought it might be instructive to other FT'ers to know about the Lai Lai Sheraton.