Should we upgrade to Windchill 10.2 from 10.1?

There are, of course, lots of improvements between 10.1 and 10.2, ranging from top-level feature bullets to smaller code cleanups and performance tweaks that are too numerous and varied to list.

That said, I would specifically note that 10.2 improved clustering capabilities if you are current deploying as a cluster or plan to do so in the near future.

1. 10.2 greatly simplifies cluster configuration as compared to previous releases
2. 10.2 removes the single point of failure of the cache master, providing automatic failover of cache master role to other server managers

The MORs contain numerous code cleanups and performance tweaks as well, so I would urge adoption of the latest available MOR while you are at it.

From a CAD integration point of view.

A major feature is the multi owner link capability

-ability to link the same CAD model to different WTpart

-be able to synch several linked WTpart BOMs with the new resolve mode in CAD to part comparator

and some smaller features like ability to synch WTpart BOM line numbers with CAD structure links ...

and if I remember the "save non checkout object in workspace"

The ECAD integration is pretty decent; if that's an interest.

All the above points are absolutely valid but There are still a few issues with 10.2, specially M030, Method servers bottleneck being the primary one.

I would suggest to wait for the next datecode before you move to 10.2.