That depends on the size of work you will be soldering on.
Ofcourse these helping hands come in handy i'm using those myself too.
But they'll tumble over if you have heavier or larger stuff to work on.
And the magnifying glass might not be at the right place for you to use, even if it can be moved around.
In that case you can consider those that can be clamped to your desk.
Searching "magnify" at radio shack will show you one that is about 3 times the price the one you already found.