I’d certainly resist a change, I just googled the Timesulin pen cap, which you can fit to some pens to tell you when you last injected, and they only do one for the disposable Sanofi pens. That would mean using a disposable pen, with all the extra plastic waste, AND the disposables only come in whole units, and I need a half unit pen (I used a Junior star when I was on Lantus). They also cost £20 online, and state that they only last one year. That would eat into any savings made by switching insulin.
It’s a biosimilar insulin that’s been brought out by Sanofi, to rival Novorapid (made by their rivals, NovoNordisk) and undercut the price.