I have some I ordered during this past season I'v not used yet. They apear to go together like a Thunderhead & I'v never lost a blade from a Thunderhead before, tho I'm sure it happens.
I took one deer this past fall with a Cabellas mini lazer pro & it died just fine. I took some ribbing from other bowhunters when they heard I was planing on using them but, you know, the name on the package dont kill deer. The newer F-3's do say Rocket on the wrench & look more durable than the mini lazers. I'll be using them next season for sure. Only have 3 thunderheads left & cant see spending upwards of $35 when I can spend $20.