This patch removes PBOD & Formations pack. Compatible with current save files from 0.8 and any 0.8-based hotfixes. I HIGHLY RECOMMEND YOU READ THE 0.81 CHANGELOG AND PATCH NOTES FOLLOWING THE LINK IN THE DESCRIPTION (sorry for Caps Lock).
- less stutters/lags in battles: Youtube.com
- better AI
- don't know any
1) Before or after installing it make sure that your and your companions' WPs are OK (don't check everyone, just a couple of them). PBOD has some night triggers or something like this that may decrease them. That's the only problem that can occur. So it's best to install the patch during a sunny day.
You can find 0.81 changelog and a lot of useful info here: