Cheap Electronic Microscopes (Anyone here have one?)

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While on vacation this year I can across an inexpensive electronic microscope and I thought that would make a cute little toy.

<< THIS ONE >> at Amazon looks kind of neat.  And << THIS OTHER ONE >> has a better rating.

Then there are really el-cheapo ones like << THIS >> at Walmart that look like complete and utter junk.

 

So has anyone here actually used one?  If so, which one do you have?  Any insights you want to share?