Myself, I really do not like softies at all, to be frank. It nicks way to much of the highs for my taste and makes the sound dull and lack-luster.
I would instead recommend Rycote's blimp-systems! These I'm very fond of. The combination of a really well working zeppelin cage, a very decent fur, a con-box to remove cable vibrations, and a truly kick-ass suspension-set makes my a VERY happy panda :-)
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It depends on your application...but, overall, I'm with Christian on this one. We have two at work, and I only use them if I've run out of the blimp systems. The softie mount doesn't isolate as well as the lyre or band mounts, and the things are THICK! All blimp systems cut a bit of the high frequencies, but these cut a bit more. Don't get me wrong, it's tolerable in most applications...it's just my personal prejudice against them. ;)
Something else to keep in mind if you do use them, you may want to put the softie on before plugging in and powering the mic. The inner mesh is plastic and very snug...scrape noise central.