Locks are still going to be mediocre at best next patch, no reason to bring a warlock over a shadowpriest. Warlock damage is absolute garbage at the moment outside of Dark Soul and the nerf to blood fear (while needed) almost criples us, while 30 sec cooldown psyfiend still remains in the game. I havn't played on the PTR yet but from what i've heard mage damage got buffed and is already insane on live.. deep + orb needs to be addressed, simply cannot counter it, and a 20% buff to mind blast while warlock damage got nerfed. Time to reroll to an actual caster who can do damage.
but presure at DS+trink is alot higher than sp one , as dots hits really pretty bad ass with those cd's , also dont forget the spamable control ( you can pretty much stop a healer for 7-8sec even with his trinket up or tremor of sham , and the 2nd time you repeat ur chain the presure gonna hit their balls).