I've been using the Active Autowerk tune since they released it back in November of 2010 (since I was the first one to get the tune done), and have done at least 15 track days since then, as well as quite a few dyno days, and the addition of probably over 25k miles. Still have yet to experience any issues.
I've not used any other tune, but ESS has been available for our cars the longest and there should be more reliability inputs from the owners of those tunes.
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