Here comes the thing: it works great, when it works. I complained before during Beta 2 about this feature being "faulty", that is it works after a boot, but if the screen saver shows up, or if the laptop goes to sleep, there goes the ReadyBoost. The way to reactivate it is to remove the SD card and insert it again.
This was happening on my Toshiba and now it is happening on this Acer. It could be the SD card though. I will have to buy a new one to test, even though this a very fast SD card, and works most of the times.
You can read about the ReadyBoost in the ReadyBoost FAQ.
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