V2500-a5
My outfit has 11 A319-131 using V2500-A5's. We've had them for about 4 yrs and have a despatch reliablity average of 99.8 percent. We also have 20 B737-800 with the CFM option. Their reliability is much the same as ours so there not much in it. The starting time of the V2500 is a bit longer though which can be a bit irritating. This would be helped if Airbus let us start the second eng once the first start valve has closed instead of waiting fir the entire start sequence to finish (about 30sec extra per start)