For HANGYU: I've used the training (HY Silver #2): Not worth the money. Spins/wobbles like crazy and the shuttle is HEAVY. It's durable but definitely not worth it. End result will be a sore, aching wrist. Currently using HY Tournament No.3: For what it is - Decent, slightly heaving shuttle than Aeroplane EG1130 (Black). Got is for $13 tube. Bought but haven't gotten around to using it (HY Tournament #2, and #1): Based on the BC forums and comments from members. There have been lots of praise and recommendation. Got the #2 for $15, and #1 for $19. Just based on appearance, it's clearly better than HY Tournament #3.
@wguang126 Mix and match your buy (Tournament #3, #2, #1) and decide which are right for your group. I'm still deciding on mine.
Boer Gold or Silver are pretty good.. Recently played with Boer Gold, they are as good as AS20, maybe slightly better. all 12 shuttles have constant speed, but durability varies (at least 1 mens doubles, max 2 )