KDP to Select or Not to Select?

When my 90 days are up on KDP Select, I am considering moving my book to other distribution channels.  Basically, what I lose is the ability to offer Part 1 for free on certain days w/in a 90 day period.  I’m thinking I’m willing to do that since Part 2 will be out shortly and while the free downloads gave Part 1 a rankings boost, there are always other free books doing the same every day, so I’m not sure it really helps overall.  I mean, .99 cents isn’t much these days and certainly not cost prohibitive to most readers. So, I’m considering putting Part 1 up on Nook and Smashwords and I guess we’ll see how it goes. Additionally, I’m already looking for beta readers for Part 2 who can receive an advance copy if they e-mail me at amcunning@outlook.com.