Hi, torzhill, I've not tried fiasp myself, but the mod tim2000s has written extensively about it, see link below which has links to other articles about it.
http://www.diabettech.com/faster-in...tails-of-the-ema-submission-fiasp-csii-study/
It seems to be like marmite - some people love it, others hate it.
I've only skim read the articles but it seems that the initial high hopes didn't live up to expectations, and it seems to have started doing weird things after a few months with pumpers, don't know if mdi people have found the same.
Like I say, haven't used it myself, but the general impression I get is that as it's basically the same as novo but with a tweak to make it get into stream quicker, it looks like ratios will stay same-ish, but with less pre-bolus.
I'd been trying to persuade my docs to let me try it, but after reading some of the reviews, I thought, nah, I'll stick with the novo till there's a bit more evidence about it. My docs were saying they were keeping an eye on it but wanted longer term studies before switching anyone to it.