We have updated to SourceTree 2.0.20.1 because of the critical URL handler issue in previous versions from 1.5.2 and because we use a local Atlassian Bitbucket server and don't want to miss out on the checkout from browser feature. Overall the UI performance and reliability compared to that really old version has degraded a lot.
First step was the workaround needed to get the URL checkout from Bitbucket working again: https://jira.atlassian.com/browse/SRCTREEWIN-7209
Next to the overall complaints about the tabbed UI for repositories that is being discussed a lot on the community here we have had no serious crashes. (Today was the first crash report to bugsplat sent that happened during shutdown of the Windows 7 64Bit machine)
The more annoying issue is the overall slowness of the UI especially when during commits the ssh-agent seems to freeze. Sometimes killing the ssh-agent task from the Task Manager allows you to finish the currently frozen action (commit, pull, fetch) but in other cases you just have to repeat it after the ssh-agent has been killed.
And because I wanted to mention this here again:
Another issue is that was reported from other teams that also upgraded to version 2.0 is that doubleclick on a file does not open it like before.
https://jira.atlassian.com/browse/SRCTREEWIN-7250