my wife's E320 Merc had the rain sensing wiper (yes, just one) and it worked great! Plus it was kind of cool to see that one big wiper do it's convoluted gyration as it traveled across the windshield.
Now she's in a Volvo S80
, so it's back to boring dual wipers. Hey, they're company cars, so I guess I shouldn't complain. The Volvo *is* comfortable, just uninspiring to drive. But so was the Merc.