I was told by someone who had them before me that they were broken and now i have have my own pair in which i tested.
First of all, it does not lower MP when using either Stratagem, not for the corresponding art or the opposite art. Secondly, i checked to see if maybe it would be a charge free use; that was also not true, it took a charge like normal.
Further testing revealed it was just a glitch int he text, it does reduce mp by about 14% more than standard Parsimony/Penury
- removing my previous long test as it didn't apply*
Seems in a nutshell if you use Penury/Parsimony consistently, you can neglect spending money towards "Conserve MP" gear.
--User:Haruhigumi Aug 17th 2011