Yep

('m sure RL will correct me if wrong ...)
If you're talking hardware releases, you want 2.4
Software: Latest available in mission planner.
My experience:
1 DR Pixhawk, 2 RTFHawk Clones.
No issues whatsoever, working right out of the box.
Have heard of issues with both vendors.
Main difference with 3DR vs clones: df13 connectors vs micro-molex.
RTFhawk case not as slick as 3DR/FixHawk.
Support:
- 3DR : Issues, but dedicated site plus if you're a potential vendor I bet they'd listen.
- RTFHawk: None from vendor, decent on that other forum.
- Fixhawk.: None from vendor, decent on that other forum, x'ept thread starter is ok with electronics but no expert yet thinks he is. Noob with advanced multitrotors. US RCTimer reseller knows way less than you do but advertises opposite whenever and will fight forever to prove so. Pathetic flame wars.
I'd recommend 3DR unless a couple hours of your time is worth less than $50-$100 savings .
There you have one!
LOL!