I own the Deal X 30mW.
All I can say is that it was the BEST $30 I have ever spent on a green laser, absolutely, positively, without a doubt,.. period! :)
sylvestor, The 30mW will not be able to pop balloons.
aDestroyer, if you want more power than the 20mW, then yes, you would want the 30mW. etc. etc.
IR Filters between the 20 and 30 are going to be the same.
It will blow it away big time. It is waaay brighter.
Just pop out your reflector, bulb and that black disc that says "do not remove" then place the optic and O-ring(both provided) in and screw it together. Flip it upside down, drop in the sandwich followed by two AA's and screw in the tail...