Please don't.
http://wowreforge.com/EU/Auchindoun/Larshunter
Change the gem in your pants to glinting and then hit optimize. You will get better stats from this site.
Using pure agi gems in your belt (adding crit enchant and keeping enchants on wowreforge), mr robot gives him
6390 crit
1491 haste
2509 mastery
wowreforge gives him
7039 crit
982 haste
2317 mastery
A 649 difference in crit rating in favor of wowreforge
A 509 difference in haste rating in favor of mr robot
A 192 difference in mastery rating in favor of mr robot
So with mr robot you are trading 649 crit for 701 haste/mastery (both lesser stats) which isn't worth it. Wowreforge will give you 649 crit at the cost of 701 haste/mastery and since crit is valued higher than both of them, it's better even though there is a 52 point difference.