While I respect the work put in, OpenOffice/LibreOffice are just unusable. I've tried since 2007 but I've had to use Google Docs and Spreadsheets instead.
I would pay a lot of money for a Linux Excel.
This used to be something I would be critical of the Thunderbird e-mail client for too, but that has come along massively in the last couple of years (so much so that I use that instead of Outlook, the quick filters are masterful). Ditto with GIMP (the Photoshop replacement), it has come forward leaps and bounds.
There is nothing technically wrong with LibreOffice. I just wish it could match Office 1995 in terms of its interface.
I have also posted an apk here (http://db.tt/UkFlvNAm) which has been tested on recent tablets (Galaxy Tab 2).
I have run Abiword on this in an ARM chroot, though on much slower hardware (a T-Mobile G2).
What Excel functionality do you need?