Hmmm.... think I'll pass. If meth::ephedra as to mcat::khat, that's going to be one fucking wicked comedown. Now, I'm one of those weird people who doesn't get hangovers, and harsh stimulants like E and meth just make me slightly disoriented when they wear off, but methcathinone pretty much nuked any ability to preform basic logic functions or due math the next day.
Example: Started snorting cat at about 6 in the afternoon. Left for a party at 10 with slightly over a gram of cat in tow, which ran out around maybe 1. The next day, my friends send me to Taco Bell with a list of what everyone wants to order and money rounded off to the next dollar. After staring at my list, the money, and the menu for like a minute and a half, I hand the money and list to the cashier guy and say, "Hi. I want this and have this much money. You figure it out." I'm really surprised I was able to walk the two blocks back to the apartment and carry the food. It wore off, but that next day really sucked.