i've heard both that these are and aren't good for arcade hacking...
One of the mods here has bought one of these before (I forget if it was pj or saint or

?)
*shrug* I'd rather have (do have) a "real" arcade trackball and would wait for a good deal to come up... and snatch it.
you can get a new wico 2 1/4" for 25 bucks... you can get a refurb'ed 3" imperial betson for 29.99... so 20 - 25 bucks for a used (?) military/CAD trackball (this isn't mame or jamma - the listing is B.S.) doesn't seem worth it...
*shrug*
rampy