Has any testing been done on how beneficial it is vs intel? I have see some references like 1 crit = 2 stats for melee, was wondering if there was anything similar for mind numb?

no data as far as i'm aware.

at best it seems 1mn:1int for me and i do a reasonable amount of climbing with it seeing i have a 46 int 11mn MQ robe.
Also this is only offensively whilst int would boost your healing also.

Crit is significantly more noticable, so i'd say mind numb influences damage a lot less than crit does for casting

Awesome, thanks for the info!