Ahh...Nek0 beats me to it, guess I'll mention something else.
The best things about HWS's funnel is that:
1. Even if funnels got destroyed when sending them out, they'd still come back to you to support
2. When funnels are in supporting mode, say they found an enemy and started attacking it, they won't ever blow up no matter how big how thick the obstacle is around that enemy.