The first saw I ever had was a Sven.  I got it sometime around 1970 and used it right through until 2009 when it finally gave up the ghost.  So I can't complain about it - it certainly did the job and back in the day there weren't many options.  However, and I'm banging this same drum again, I replaced the Sven with this, the Fast Bucksaw:
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This baby is so far superior in every way to the Sven, it's unbelievable.  The Fast Bucksaw is so well thought out - well made, lightweight, fold away with no loose parts and cuts so straight and true that you could practically use it for a furniture saw.  Just about my favorite piece of kit - 5 stars out of 5!  I've also used the Sawvivor and others - not in the same ball park.