These appeared for a brief time in the very early 90s and I was completely obsessed with them. Standard salted hard pretzels covered in milk chocolate. It was one of those 'Marmite' type products that you either loved or hated.
I'm guessing that the British population just wasn't quite ready for something that exotic as after a couple of years building up a bit of a cult following, Pretzel Flipz disappeared from our shelves for good. After a little while of desperately searching the supermarket shelves, followed by a brief period of mourning, I moved onto other snacks. After all, you can't let candy rule your life and there's always another tasty snack down the line somewhere.
However, those more open minded Amercians, much more comfortable with the ideas of a sweet and salt snack than us stick-in-the-mud Brits, took Pretzel Flipz to their hearts and the Flipz have continued to flourish in the US. This means they can now be hauled back across the pond for us faithful Flipz lovers to enjoy.