Yeah - I could definitely use the Cha cloak - my Blast saves depend on it, though I've only got one save-using invocation at the moment (I'll be getting more eventually). If Use Magic Device is transparent with Use Psionic Device, then taking it would mean I could conceivably snag the psicrown as well and massively increase my utility/flexibility beyond shooting laser beams. I'd have a 23 when taking 10 (yes, I can do that, Warlock class feature), so after I play around with the crown enough to blindly activate it once, I'd have the +2 circumstance bonus to future activations and be able to make the DC25 check every time. That'd be swiping a huge chunk of our loot for myself though, which isn't totally fair.<br/><br/>If UMD isn't transparent, though, that plan gets tanked, and the only use I have for the cloak is improving my Eldritch Cone save DC. Still useful, and it'll be more useful as I gain more invocations with saves, but if there's a Charisma-based caster in the group already, they would want it more.