Cross-wind items are tricky to use; see GM posts
here and
here. Given Mathilde's habits, when she's casting regularly she can only make use of items which make use of
ulgu (compatible with Mathilde's normal magics), dwarf runecraft (aethyrically neutral), or have short-term effects (the winds aren't around for long enough to have interference with other magic on Mathilde turn them into
dhar). When we were looking at College Favor items last time, I
really wanted an item of Second Portent of Amul and the reason that I backed off from that was the cross-wind effect.
While
dhar contaminating Mathilde is no longer a concern thanks to her belt, the effects will still interfere with one another to create
dhar, it'll just burn off. That will disrupt the spells involved and cause them to collapse. So if we want to use some of the excellent mental boosters the other Winds can offer, she'd have to remove all other active magical items and refrain from any of her own casting when using them, lest we get cross-wind contamination. They could still be very useful under those restrictions, but would functionally be a form of specialized, expensive lab equipment.
I'd still be willing to go for one of them (probably not both as I doubt they'd stack). The bonuses that they provide are
very substantial and could make a big difference to what Mathilde can come up with. If the College Favor cost remains the same as when we went for healing items either of those will probably be within our reach given a couple research papers or the general appreciation of the Colleges for our success in stamping wizardly influence all over the reclamation of Karak Eight Peaks.