LOL! That's funny right there.

I see it as a weapon that is in need for a use. A grenade, depending upon classification, performs its intended use as designed to it's maximum performance. For instance and M-18 does its job well as it was designed to do. The old AN-8 did its job very well and has been replaced by a less superior designed M-83. The M26 did its job better than the old Mk.2 and so on and so forth. Multipurpose grenades do not usually end up performing any one function better than a single purpose designed grenade.

I see potential problems for this type of grenade starting with its fuze. The fuze bothers me because it is electronic and electronics can be very sensitive. For instance, If I were to walk under high tension wires or doing a nighttime raid on a hydroelectric dam or a power plant would the residual voltage cause my fuze to go off or become inert? It would make me think twice about doing it with these grenades. Also, I'm not buying their design and its so called versatility especially a no spoon design. Also, what will extreme temperatures do to this type of fuze? In my studies of grenades from around the world I have yet to find a single nation that still uses electronic fuzes. I am thinking that this design of fuze might be on similar pars with the old fuze seen on the M-25 series of CN/CS grenades whereby you keep the fuze pushed down with your thumb until it is thrown. The fuze is then activated by mechanical pressure (spring) to arm. The fuze is OK in a Chemical munition but a lot could go wrong on a lethal fragmentation grenade.

IMHO, the only thing that needs to be fixed on the newest model of the M67 might be to switch from an all metal grenade with fixed fragmentation (scoring) on the inside to a polymer based body with integrated steel balls of various sizes depending on what the end user would see fit for max pattern. The "Max Pattern" of fragmentation would be done under controlled and real field use experiments. The fuze can stay the same metallic material w/metallic spoon.

The only switchable fuze I have seen (I own an INERTED version of the live one) would be the Czech URG 86. It had an actual mechanical flip switch with back-up delay built inside. From what I have heard from the Czech Republic it worked well.

Oh, and by the way, the Mk.3A2 was a great grenade. I am almost positive that history has yet to record a user sitting around somewhere in combat sniffing the grenade or getting Mesothelioma from its use.

Again just IMHO.