BCC Hardware posted a review on the Crucial PC2-4200 DDR2 Memory

We have just posted up a review of Crucial's 2GB SODIMM Kit. This kit comes with two sticks of PC2-4200 DDR2 memory that will give your laptop a worthy upgrade if you are running 256MB or 512MB. We compared this kit to the stock memory in our Acer TravelMate and have been impressed with the stability of this new memory. If you want a lifetime warranty on your RAM - this is one of the best ways to go.

Crucial PC2-4200 DDR2 Memory Review