… well I won’t use swear words, but not that great.
After taking the best part of an afternoon to uninstall 9.3 and install 10, it seemed to hang a long time on removing 9.3, the next day I notice that all my settings set in 9.3 aren’t carried over to 10, which led to the following issue:
I open up an MXD, with a rotated data frame, all my symbols are rotated, ah! I thought, I’ve been through this before I just need to go into AdvancedArcMapSettings.exe and uncheck that box, rotate symbols with dataframe something or other, well I do that and reopen my MXD and those darned labels are still rotated. I go back into AdvancedArcMapSettings.exe and see that the box has magically checked itself and after repeated attempts I realize that it’s not sticking when I turn off that setting. This has me perplexed as I have full Admin rights on Windows XP, I install and uninstall programs all the time. After further digging I realize that I need to edit the registry setting and find out the cause of the issue, the Registry entry for this setting – RotateWithTransform – isn’t even there, I add the entry back in and bingo all my symbols align correctly.
Today I go into an MXD and need to create a new label and the client wants that label to appear in the legend, unlike Manifold, ArcGIS does not have the capability to create a legend entry for labels, no problem I thought I can just convert the labels to annotation in the map and copy a label from the dataframe and paste it into the Legend area and boom my first ArcCrash with 10, right now I’m trying to shut down Arc10, but even using end process the bleeding program won’t shutdown, thanks ArcGIS 10 for wasting the best part of an hour.
Bah humbug 10 indeed.

Be sure to install SP1. You did very well to get through the blog post without swearing. v.10 is worth installing, but buggy as heck. Similar to going from v.8.3 to 9.0.