[D&D 3.5] Arcane Swordsage adaptation question

[Coidzor]

So, as a fair number of people agree, giving the proposed Arcane Swordsage adaptation in Tome of Battle unlimited spells at will as maneuvers (with or without such spell maneuvers being accessible by anyone using the feat "martial study") is pretty broken.

But a thought just occurred to me when I read this thread on class adaptations and reading Aslancross's post after scrolling past this thread on warlock invocations. Invocations are at-will, considered arcane, and viewed by most to not be broken at all.

So how bad is it for invocations to be used by a swordsage?

edit: and no, no spells available to such an arcane swordsage as I'm positing, just looking at invocations and how bad that would be.