Originally Posted by
onlySIA
Just in case anyone is looking at this to check if W can be upgraded, you are in luck. Since this thread was started the rules have changed and this class can be upgraded with points, though at a higher cost than B/E//Y.
I can confirm this. I just upgraded a booking from W to business on an upcoming flight (SQ876 SIN to TPE). I was thrilled to see saver availability and I even managed to grab bulkhead seat 11K. At 25,000 miles I felt it was good value.