Sorry, I have no experience about Exselo and Lookeen.
I have finally bought Archivarius in order to do a full testing. I really do not like it, and as far as I have tested it, I find X1 far more reactive and much simpler to use.
That is the reason why I would like to keep X1 and improve my X1 5.2.3 version behavior.
My main concern with this version of X1 is that it does not index the content of docx, xlsx, pptx, odt, ods, odp, and xml files.
Has somebody found a trick in order to solve this?