I can't give a fair review as I cannot communicate with the device. I cannot program it even following the tutorials online. The seller responded quickly but only to say he cannot help because he doesn't own a Macintosh. This processor is SMD and soldered so cannot be removed to try programming it externally. Unfortunately, I chose this particular model Attiny85 to try as my first experience with Attiny85. The seller has many different configurations and possibly I might have had success with other a different setup. So consider this review "Neutral".
Purchased to control a simple set of switches. Can't get Windows 7 to recognize the device at all, tried for hours. Not sure if it's a dud or if I'm missing something, documentation is sparse. Contacted the seller via Tindie response form, no response even after a couple weeks.