I've been redeeming miles from my CPlus account over the past 5 years.
100k or so business class YVR-SYD in 1995. Started looking for seats on outbound flights from mid-Dec. '94 and didn't get availability until late January '95.
Cashed in 65k for business class LHR-YVR and was able to get seating over the x'mas hols in 1998.
Cashed in 80k for business class YVR-NRT and was able to get pretty much what i wanted in Nov.-Dec. 1999
Cashed in 150k for a oneworld award that included QF and CX flights. Planned end of Dec. '99 for flights in late Jan. 2000-mid Feb.
Cashed in 150k for a BA F award YVR-LHR-BKK-SYD. Some (lot) of problems with availability on BA end.
Also cashed in 100k in late 1998 for YVR-SYD but returned it. Some problem with availability (joint service CP-QF codeshared flights)