These solve the fundamental problem that I have had with airsoft grenades thus far.
Let me ask you a question. When playing, how do you know when you're dead? Because you get hit by a BB, thats why! Why should it be any different for airsoft grenades?!
Initially, I saw a serious issue with the rubber grenades in this respect but have since grown to love them because there simply was nothing else. In a real battle, I would NEVER be without a few frags. In airsoft, I find them very useful for bridging that gap cause by the lack of penetration through foliage by a BB alone.
Now that these have arrived, I think we need to start a transition. The probelm right now is that we will have both grenades. As long as people are going to be allowed to use rubber frags, I don't see the point in using the more realistic variety discussed here.
Is one or the other, but I like the BB-tossing type much better!
Also, I see the money issue as a perk. If they were dirt cheap, we'd be having frag wars, which is completely unrealstic. Even now, I often see frags used when a BB would suffice. Sometimes people use the grenades simply to justify the cost and possession.