In the FWIW category:
In the past week I have discovered AndrOpen Office which is a fork of Apache OpenOffice 3.4.
Though it has some significant issues, it is at present a more usable app than LibreOffice for Android.
I use the spreadsheet feature (Calc) of office suites about 95% but AndrOpen Office 1.4.x supports the full range of OOo derived tools. The UI of the app is a mite difficult to use on touch screen based mobile devices.
One LO feature that I miss in AndrOpen Office is its enhanced implementation of protected cells.
I hope this report will increase interest in the development of LO for Android. I am very willing to provide my thoughts regarding UI features with interested developers off list.