I've come to rely on Moleskine notebooks for work, personal use, for design mock-ups, and to organize the thoughts in my head. The hard cover ones add weight to a bag, so when I found out about the soft cover version, I was thrilled.
That thrill didn't last very long.
Because the notebook doesn't lie flat, you have to crack the spine if you want to use the notebook on a flat surface. After doing that once, the cover came off. I tried using library binding glue to reattach my cover, but to no avail; the cover just won't go back on.
Not only that, but the back pocket in the soft cover version isn't as sturdy as the pocket in the hardcover editions, and it easily detaches from the back cover.
All in all, these are only worthwhile if portability/weight is more important than longevity.