for those working on NT networks (MANY MANY people)
10.1.5 is a major development that we have been waiting for since the release of OSX.
The ability to use classic software on an NT server without crashing the finder and or apps.
10.1.4 addressed some of the issues, but 10.1.5 seems to fix most of the bugs. Still some issues as to file sizes and corruption of files under 10.1.5. But from all advanced reports it is at least working. Unlike all previous OSX releases.
On the point of paying... 10.1.5 must come out before 10.2 if apple wants to charge for jaguar inorder to aviod lawsuits. Apple promissed legacy support under OSX, but as to date they have been unable to completely deliver on this promiss. If they do not release 10.1.5 for free before they charge for 10.2, then they will esentially be charging their customers twice for the same service. Look for class action suits if they try this.