The actual discussion on the MyFiles block since its launch is here : http://moodle.org/mod/forum/discuss.php?d=31943
It works for 1.5.3 or 1.5.2 but it has many bugs which are listed in the above forum link. The biggest problem is not being able to unshare a directory once shared and some of the shares not working proper. Unfortunately, the developed code is also not as per moodle's standard coding system so we're not able to do much with it either !