Drain Tank leveling

[str4jo]

Hello, I'm leveling a warlock for the 2nd time, just hit 40 which gives me access to t7 abilities and I'm thinking of leveling up to 80 running a drain tank play style and spec ( http://www.wowhead.com/?talent#Ifxbbhrhof0o which will start to shine at 42 when my felhunter gets shadow bite, I'll use Imp these 2 levels)
Anyone tried this, has any tips? pros/cons?

[gherkin]

Play whatever you want, but a normal affliction build will be kept alive by Siphon Life alone. Drain Life is a backup.

Check out my guide at the top of the page, but feel free to do whatever you want of course. Leveling a new character should be fun before its a chore.

[viR]

I leveled my lock recently and with voidwalker sacrifice and soul link (not really needed tho) you have no downtime and can kill 4-5 levels at the same time, depending on gear and level, i took glyph of siphon life for extra healing aswell.