What is the crowd's opinion of Forward SMS texting w/ 2phones?

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I found it on the play store as well, unless this is the wrong thing

Download Forward SMS texting w/ 2phones https://play.google.com/store/apps/details?id=com.mysms.android.mirror

Also

https://play.google.com/store/apps/details?id=com.mysms.android.mirror&hl=en

and

http://www.zdnet.com/article/how-to-send-receive-texts-on-two-android-phones-from-a-single-number/