If the package looks like this, is it 1. or 2. gen then? http://dgibadmintonshop.dk/90-120-thickbox/ashaway-zymax-62.jpg I have just noticed there is different kinds.
Compared to : http://www.stringersworld.com/shopimages/products/normal/zymax62new_reelylw_200.jpg sorry for repost :/
Looks like the older packaging that is 1st gen. Had a quick look at the website and found it strange that they have new packaging for the other Zymax strings.
I've never personally compared them, but some users on here claim the newer strings are improved having used both versions.
For ZM62, the newer gen is only good for durability, whereas the first gen is not that durable but has great feel and repulsion.
Well... going from lasting 30 min play on gen 1 to lasting 60 min play on gen 2 is still a 100 percent improvement.
Presently, trying out ZM62 27/26 lbs & ZM65 26/25. The former is very much alive n kicking compared to the latter. Future choice depends on durability.