Robotic solar powered surface skimmers

There are a couple of threads about the Betta. I've owned mine for nearly a year now and had overall good results, but had to send it back once for a warranty repair. I haven't looked into the changes made in the Betta 2 versus the original yet either.
 
There are a few threads that review the Betta, this one, starting around page three starts talking about revision 2


Seems to be hit and miss with the results I've read about around here. Version 2 seems to work better than the first one.
 
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