This is not true, AND it's the big difference between the Drive Extender of WHS and Storage Spaces. Sure, the result is the same, a big pool of disk space, but they did start from scratch when they gave up Drive Extender. With Drive Extender, it was possible to remove a disk from WHS, but it in an external enclosure or a different Windows system and the disk would be readable. This is no longer the case for Storage Space, which makes it a BIG risk IMO. AFAIK, there is also no redundancy with Storage Spaces, only drive pooling, making this even more dangerous.

Also, since it's a new technique, data recovery software hasn't been developed for for, so if Murphy hit, it'll hit hard! I've actually read a story where one user of SS had a failure and contacted Microsoft about it, and he actually got the message to put the drive in storage somewhere for a couple of months, until data recovery software had caught up with Storage Space and it would be able to retrieve data from it. :$