(I thought I had more IF, but I guess it's just this one from a couple years ago.)
I haven't seen any of their "every day" bags as a must-have for me. I've admired some like the Audra, but never went all the way for one.
I do really like some of their other lines, like the tattoo designs, those zodiac pieces from a couple years ago, the patchwork and crochets, the "Off the Wall" graffiti stuff from a few years back. Love it or hate it, I think you've got to admit that they go full speed ahead with an idea and don't water things down. And they're always moving forward to something different, so even if you hate this one, the next thing might be for you.
My single piece of theirs is a smallish graffiti hobo from several seasons ago--I still like putting it into use once in a while. None of that kind of stuff of theirs would ever be considered "classic" by any means, but I do think it'll still look good any number of years from now. Partly due to the decisive design in each little collection, but also thanks to the quality of construction, materials and hardware. Everything I've seen from them looks like it was made to hold up.
So... I guess I've only been moved to shell out for one, single Isabella Fiore, but I do think highly of the brand and can't wait for the next thing to catch my eye, because I won't hesitate.
(I do have one pair of IF shoes, the tattoo-embroidered "Lauper" ballet flats. They're cute, basically comfy and always get compliments, but I don't love them nearly as much as the bags & wallets. The shoes are actually kind of meh, comparatively.)