Locks are great CC utility. Damage-wise, the popular spec is affliction, and the damage itself is poor. UA offers dispel protection, but the spec itself isn't really a major source of damage unless you dot everything you can (which isn't a good strat). I haven't tried Destro, but it seems like it can burst when it needs to.
Your Chardev looks good, except I would drop skinning for engineering myself. You really need the + 20 spell pen to cloak as a warlock, and engineering cloak is the only way to get it on a new character now. If you don't use spell pen, a lot of your fears are going to get resisted, and a portion of the damage from each one of your spells will get resisted. Even with Rune of Perfection, you're looking at players with 29 resistance to shadow spells (undead) and 10 spell pen does not negate 29 resistance. Even just the +20 from the cloak enchant is not enough imo. I would get the cloak enchant and the trinket tbh.