Just curious about ya'll thoughts on Old Heise and whether it is a viable speedsolving method. I am aware of Speed-Heise 1 & 2 but am more curious of Heise's original proposal for a speedsolving variant of Heise. I'm also interested in ya'll thoughts on Old Heise vs to Speed-Heise 1 & 2. Also is there anyone who seriously uses any of these methods ?