I have played with the color-changing one at Lakeshore. Maybe the one they had out for demoing was broken, but it didn't seem to work very well. You had to leave your hand there for a LONG time to get it to change--again could have been something like my hands were cold/the store was cold, but I wasn't impressed.
This thread brought up and idea I had last year about product/toy reviews. If any of you are interested in reviewing a toy or product I have a place where you can do it called Building Blocks
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