Was surprised pop bumper didn't make the list or kickers. As young pinhead i have always thought no pops and drops made a machine not worth my time. But this was mostly due to what i was exposed to. Have had some use of all the target types but probably not enough of some. With more exposure to em and a chance to interact with more of these the list may change. I look at the stand up target as the cop out to something better either by choice or due to cost.
1 Drop target
2 spinner
3 Pop bumper
4 Roto unit either style drum/roll
5 spinning disc (I know this didn't make to many machines but i like them)
6 Kicker sling
7 Vari-target
8 stand up target