Take a look at the LEAP flight test hours on the neo through the start of June. As of COB yesterday the program has accumulated nearly 14 hours of block time and just over 8 hours of flight time.
Both neo engine programs appear to be on target for their development time frames, early 2016 for GTF and 2017 for LEAP. Both are expected to achieve their performance targets. We won’t know about reliability and maintenance costs for certain until they are in service, but preliminary indications indicate the GTF is performing as planned, while the LEAP is just starting its testing program and it is too early to tell quite yet.