"As of 22 November 2012, the CAPS has been activated 32 times with 63 survivors and 11 fatalities in equipped aircraft." Wiki.
Wiki slightly out of date this was number 39 as far as Cirrus concerned and the success rate is 100% to date when operated within limits.
Clearly this success rate can not last but for me it is good enough and even if success of forced landings is lets say 90% I do not wish to play Russian Roulette with a 1 in 10 chance of serious injury or death when I fly an aircraft with BRS.