InsaneTek has posted a review on the Mushkin DDR2 PC2-4200 1GB DC Kit

Mushkin was a bit slow with the release of DDR2 solutions. The first and only available choice for DDR2 was their PC2-4200, rated at 4-4-4. The latencies were rather high for a speed of 266MHZ, but they did come with nice silver heatspreaders. Mushkin has now expanded their line of DDR2 options. There are now two choices of PC2-4200 memory, one rated at 4-4-4 without heatspreaders and one rated at 3-3-3 with heatspreaders. The sample we received today would most likely be PC2-4200 3-3-3 with a heatspreader, although the sample was not clearly labeled.

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