Ive been waitlisted about half a dozen times and notified of clearing through email; they are generally very good with the emails, but cant comment on the sms service.
Thanks for the feedback - think I might stick to e-mail in the future.
A slight note of caution with waitlisting though (might be slightly off topic so apologies in advance but some may find this experience interesting);
No, thanks for sharing - good to know about.
To be clear, did the 747 -> A380 aircraft substitution happen
before you confirmed your flights, or
after your confirmed them but before you paid for them / had them ticketed?
Either way, pretty annoying

. If it was the former
and they cancelled your waitlists at the same time as the aircraft substitution then I personally don't think they'd have done anything wrong, but once they cleared your waitlists and let you confirm them they should have honoured the ticket regardless of aircraft change.
I wonder what was different between you / your situation and the others you mentioned that they wouldn't honour the tickets for you, but would for others?
On a different note (and even further OT):
1) Has anyone else had problems confirming / ticketing previously-waitlisted awards online? When I tried to confirm and pay for the flight that lead to me starting this thread the SQ website took me right through the confirmation / payment process, and then on the very final screen errored out. Error basically said "something went wrong, we've already charged you credit card but will reverse it in the next few days, please call us to sort out ticketing". The booking
completely disappeared from "Manage Bookings" on the website at the same time too. All was resolved with a quick call to KrisFlyer customer service - they didn't try to screw me out of the 15% online discount either - but still annoying.
2) Anyone know if SQ will substitute for a larger aircraft (assuming one is available) if load factors potentially justify it? One segment of the trip that lead to me starting this thread is MEL-SIN on SQ238 in August - scheduled aircraft is a 777-300 (refitted) and it's already very full up the back ~4 months out ( F4 P4 A4 Z4 C4 J4 D4 S9 Y9 B9 E9 M9 W0 Q0 N0 H9 V0 T0 L0 K0) - wondering (hoping!) whether there's any chance that they'll swap the 777-300 out for an A380?