One review after another led me on and on to other products, getting increasingly more expensive.
They almost seem like a gamble -- with some people saying one or another works great! And then other people say no, it's crap.
Well here is the site (USA -- but click on the links and read the reviews) -- might be helpful.
I didn't end up getting any just yet, btw. But I'm leaning toward the Blue Icicle (even though it's made of plastic...) for its overall pretty good reviews and inexpensive price. BUT I have not tried it yet myself!
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