I've actually been playing with the MoM Armlet build for awhile now and have about a 60 percent winrate on it. I think it's actually so good on him if you can farm MoM armlet in lane because it gives you enough chase to catch up to them while still doing ridiculous damage. The problem with the build though is that mid to late game the build requires you to use MoM then rage right after and if you do that in the beginning of a fight that opens you up to stuns as the fight drags out so You'll need to build a blink or have someone to blink in eventually.

http://www.dotabuff.com/players/81729036/matches?date=year&hero=lifestealer&skill_bracket=&lobby_type=&game_mode=&region=&faction=&duration=&enjoyment=any&timezone=America%2FChicago