I have just started playing combat on my alt rogue, it took me forever to get weapons. I am just wondering about deep insight and cooldowns. Should i save them for deep insight if it's not that far away?
If you're just a few ticks off and you have the energy to get there quickly, sure save for Deep Insight. However, if you end up holding CDs so long that you miss a use over the course of a fight, that's a sizable loss.
Only hold them if you're close to a higher insight or any insight. For Example, on Iron Jugg I built to shallow insight before going into Killing Spree whereas I see plenty of rogues that go into Killing Spree right away. If you are one RVS or Sinister Strike from triggering Deep Insight or Moderate then go ahead and do the builder before going into a cooldown.