Hey
@Omnipod - I've been using it since it became available in the UK in March. I've had my ups and downs, but persisted with it. I'm fairly sure it was responsible for my Hba1C going from 5.9% to 5.5% as a result of reduced post-prandial spikes, but I'm not going to say that it's been smooth sailing all the way.
I've found it certainly acts faster, but there have been other effects that have been seen by many users. My write-ups can all be found under:
http://www.diabettech.com/faster-insulin and what other people have found can be read here:
http://www.diabettech.com/user-resources/user-experiences-of-fiasp/