The Air Force has preferred provigil (modafinil) for their pilots. On a scale of 1 to 10 with 1 being a Diet Coke and 10 being Adderall/Vyvnase, it is about a 6 or 6.5
Clean energy with no crash or sides (appetite loss, jitters, racing heart or libido death). Fairly cheap as well. I get a box of 10 strips, 10 tabs 200mg per strip (100 tabs total) for about $12USD at the airport in India. It's about $3 for the same after you leave the airport. Everything at the airport is higher, but still cheap by our standards.
It is 1100 baht (about $35USD) in Bangkok, about 3900 in Phuket (about $135USD) but only if you can find it. It is hard to locate much like ambien, soma, etc.. but not impossible like Hydros, Vics, Xanax, etc.), but only $500 baht in Chiang Mia. There was a peptide company that carried it on their "secret" list with some other narcs, but I wouldn't trust it from someplace like that. Not sure if it is still on the private list or not.