Confirming! And going on a small tangent (ha!).
Our previous configuration was Lustre and XFS/NFS; the former was the scratch file system for HPC applications and the latter for home directories and what not.
Lustre was definitely a beast (in a good sense), but we'd occasionally get bit by a work load high in metadata operations - which would bring Lustre to its knees due to latency.
XFS/NFS was great for its purpose (no HPC workloads), but we'd also get bit by a user or users reading seemingly tiny, innocuous files (inadvertently in parallel) which would cause load averages to spike; surprisingly the latency wasn't as bad as the Lustre workload mentioned above.
Not too drink the GPFS kool aid here, but it's definitely solved both problems above. It has its issues, but definitely handles the common I/O patterns seen on our cluster.