We use 5.005_03. Why? Well, the app we work on started about 6 years ago. We haven't upgraded yet simply because it hasn't been worth the effort. We were actually planning on upgrading to 5.8.4 this february, but the project got tanked when the contractor we'd hired to do it for us turned out to be a complete and total train-wreck (not that we needed a contractor... it's complicated: we hired this guy as a contractor because we sort of wanted to test him under controlled parameters, with a fairly isolated project, and we're glad we did). So, anyway, it'll happen eventually, but right now our developers are otherwise occupied.
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