I'm JC/LW atm.
The extra Agility from the bracer enchant is really good. And with JC gems it's easier to fix hit and expertise caps.
I'll most likely be gemming expertise with my 'big' gems. Checked my mates beta premade rogue and it was WAY from the expertise cap even if I gemmed it mostly hit/expertise to reach caps.
Gonna suck getting the cap without the expertise+1.7k agi proc trinket(Left eye of rahj I think it was)
+ You save alot of money not having to buy leg and bracer enchants! :P
- all of that saved money will be going in leveling your JC!