Hmmm, I got my hands on a different grenade that is similar in mechanics to this one.
((EDIT: Ask anyone at the last OP: Gun Doc Day, I must have set that thing off 15-20 times! So much fun, yes, me and explosives are a bad mix!))
This one seems a lil more costly on use than the other as it just used propane like a GBB mag. But I'd forsee this one making a much louder pop.
The only thing I could see that would make this thing more fun to use itself, is a tether between the two halves so you don't spend time trying to find the other half! But seeing it has two plastic end caps it would probably not be difficult to secure a tether to each end.
"The hydrogen economy car from the people who brought you the 'Hindenburg
'" - Glen Foster
Condoms do not guarantee safe sex any more. A friend of mine wore one and was shot by the woman's husband!