Change is inevitable
I was using Perforce for the past 3 months and now I have to use Subversion at my new project
I have used Subversion in the past but I started liking perforce due to its ease of use and simple commands
Only pain was having to do a p4 edit on each file before editing it
I stumbled upon this nice article about Perforce to Subversion migration
Although the article is mainly about migrating code , it also talks about equivalent commands in perforce and subversion.
I found it really useful
Also theregister had a nice comparison