We have about 60 users plus 16 phantoms. I hate UNIX but have learned to live it. We still have to have programs changed etc. There are 2 very different issues here - implementing a Pick system and administering a customer's system. I haven't worked with anything not based on the original Pick assembly language code.
Some aspects are easier and just as many are harder.
A lot of time is saved because we no longer have to write a disk driver and a disk formatter for every new disk that comes along. On the other hand, we do not have the same opportunity to squeeze every last bit of performance out of a particular piece of hardware. Unix disk drivers make certain assumptions about how programs want to use disks and those assumptions don't always match well with what a Pick program might want to do. The Pick assembly language debugger had capabilities that simply don't exist on the Unix systems. We've generally lost capabilities there.