Don't worry about SLES. Reiser3 after some initial issues was actually quite robust, and was designed for robustness. If there were issues after the initial shaking down period it was because of the O_PONIES problem that causes so much distrust against ext4 itself, and previously against XFS; but not against JFS because JFS has always had a rather twitchy flushing logic sort of equivalent to the short flushout ext3 has always had.
Indeed ext3 got a good reputation mostly just because even when it did not support barriers it had a very short flushing interval etc. which made it seemingly resilient in many cases to sudden power off even for applications that did not issue fsync(2).
To some extend it is sad that SLES switched to the ext line, but I guess a large part of it was marketing (it is an
industry standard) and the sad story with Namesys.
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