Didn't use Doc 2 Go so can't comment.
I use Office 2 HD.
It is fine for Excel.
But bit of frustration for Word. Main drawback is that it will maintain WYSIWIG format information BUT it will lose Word style information.
For example, if a word is defined as Heading 1 in Word, that information is lost when it is saved in Office2 - although visually it will appear the same.
Formatting is some tables is totally screwed.
As a result table of contents etc. is not supported in Office2.