Changing insulin

I've been on my pump for 6+ years and I have always used Humalog, however my insurance benefits are changing soon and it would be significantly cheaper to switch to Novolog.  I'm going to talk to my doctor about changing (I'll need him to write the RX anyways), but I wanted some feedback.

Has anyone here ever switched between the two?  Humalog to Novolog?  or Novolog to Humalog?  I know it's basically just a brand change, but I know that can make a big difference with some medications.  Any feedback you can give me would be wonderful!