i’m a primary dungeon runner, so my opinion is a bit focused on dungeon content:
the idea is great but there are too many issues with it atm.
for example if u cast you elite afer mimic you set mimic on cd without getting anything. same with mantras/heal.
also it often happens, that you cast the skill you want to mimic twice with one klick, so you waste your second cast without being able to avoid (the 1sec cd seems bugged)finally to realy get use of it i’d say it has way to high cooldown. 90 sec usually means you can use one utility twice every 4th time.
i’d love to get it on the same cd like the skill you used , so if u use nullfield mimic set on those 32sec cd.like it is, its only usefull in very few situations, like larger skips or when you want to travel a bit faster using blink.
FWIW, you can get the cooldown down to 72sec if you trait for it 
