I recently changed. Fiasp is a load better for me, however my endocrinologist suggested a dose of 90 per cent of my previous dosage For the first few days I needed only 30 percent. Now I have got used to it my number of “ highs “ or BS over 10 now average 2 a week. It is a load better but does behave very differently to my old Humalog. P S it cost the NHS the same as my slow fast acting Humalog.