Glargine was a revolution for feline diabetics. We did fair but not great with beef/pork insulin, but the aa sequence of human insulin is not as close to dog and cat insulin, so when the recombinant human insulins cam on the market and the beef/pork mostly went away, things got worse for cats especially. Now with glargine, we get maybe 75% emissions where we can wean the cats off insulin for months to years and we get much better control in the ones that remain insulin dependent. I do occasionally see a cat newly started on glargine that is very hypoglycemic, but they hardly ever are clinical for it.
So I sort of hope they don’t find a “better” inslin than glargine for humans just because if they do and the pharmas can’t make enough money selling glargine for kitties, my diabetic patients may be SOL.