I find they look very dark, almost threatening and quite sci-fi like.
Why do you emphasize the "x" so much as the only constant element?
I find the "MOD" to be more significant and think it should appear always.
Besides that you introduce a spheric element here which I've never seen before in the MODx visual context.
EDIT: When I saw the "The SEO CMS" version I spontaneously translated it to "Senior Executive Officer CMS"
