but the compatibility with Word and Power Point is not there
I can't speak about PowerPoint, but I have had ZERO trouble with SoftMaker Office and Word documents. My word processor documents have, historically, not been terribly complicated--but they did have formatting issues that caused OpenOffice.org problems.
One point worth keeping in mind: absolute perfection 100% of the time is probably impossible. Theoretically, sticking with MS Office should mean zero troubles. But issues can and do crop up going from one version of Office to another. Even within a single version day to day there can be problems. Someone who did legal work told me she's had huge problems with Word. She gets a document formatted correctly (and in her business formats are rigid and have to be "right"). The next morning, the computer gets turned on, loads some MS Office patch, and the next thing she knew was that her perfect document is no longer perfect and needs more tinkering.
Unless 2007 file format support--both read and write--are absolutely necessary, an older version of Office might also work. The loss of 2007/2010 formats aren't that big a deal--at least for me. The older formats are supported, and probably better supported. In fact, I just submitted a document electronically this last week. It HAD to be Word ".doc." It could NOT be anything else--not even 2007 ".docx."
Before I got my free copy of SoftMaker Office, I was considering going down this particular path of "older" MS Office just to minimize MS Office headaches. I was looking at either Office 97 (which can run on my computer using WINE, which allows Windows software to run on a UNIX-type system) or Office 98 (for the Mac). These support the "modern" ".doc" Word documents, which is what I needed, and are old enough to be depreciated out. (I'd never use MS Office unless I need it to convert a document to an MS Office format, or open someone else's MS Office document.) SoftMaker Office though proved to be everything I need--at least for the moment--so I shelved the MS Office idea.
Once again, for opening new 2007 formats to read, there are those free MS viewers.