The oldest one is over a year old and has been used in several different projects including one that ran continuously for 160+ hours. I can't say much about the long-term reliability of those boards (my guess is that if you buy enough of them you'll notice that on average it isn't that great compared to that of boards with officially sourced MCUs) but the ones I got for myself and acquaintances (different models, six total) work as specified for now. At their price point the latter can compete with ATtiny85 chips directly despite being noticeably more powerful and more convenient to use in many cases. My personal experience with boards roughly the size of the Trinket has been as follows: I have purchased a Pro Micro compatible with an ATmega32U4 chip and an on-board MicroUSB port from a Chinese seller on eBay for under $9 as well as two no-name Arduino Pro Mini variants with ATmega328 chips from two different eBay sellers for around $4 each, all fully working. I rather like the new board but since we're talking low-cost alternatives one thing to consider is buying Arduino-compatible boards directly from China.
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