Here's the thing: I've never used, let alone owned, one of Nintendo's Robotic Operating Buddies (aka Family Computer Robots in Japan).
There's a good reason for that, of course. Actually, there are two good reasons for it. First, the NES Deluxe Set--the one that included an R.O.B. and a copy of Gyromite--was pretty darn expensive when it was released back in the day (late 1985 here in the States). Second, the early word on the street--or the word in my small-town-Wisconsin neighborhood, at least--was that the R.O.B. and the games that utilized it were duds.
Anyway, as is often the case with my gaming obsessions, my childhood lack of experience with the R.O.B. and its games has me (somewhat) clamoring to own one as an adult. Unlike most of the games, peripherals and systems on my wish list, though, I can't really see myself buying an R.O.B. or copies of Nintendo's "Robot Series" titles anytime soon.
Someone calling himself Alan Rappa on Flickr seems to have three of these SAINT Number 5-esque accessories (as evidenced in the photo here and above), though; maybe he'd be willing to give--or even loan--one of them to me? Yeah, I doubt it, too.
See also: 'I want a Famicom light gun'