I read through most of the reviews here on amazon as well as on the actual crocs website. I'm about a size 7.5 US (5.5 UK / 38 Europe and India) at least with open sandals. The crocs site suggests that you order a size down for this particular model, if you're a half size, so I ordered the 7B(M) and it's perfect! The sandal is light and  lovely! The color is so neutral and neat looking.
The only reason I didn't give it five stars is because the straps are slightly loose. But I already knew about this problem before buying so its ok. Strangely, the strap on the right slipper feels a bit looser than the left! So these sandals flop about a bit, but it's still wonderfully comfy. I havn't worn it throughout the day yet, so perhaps I'll come back and re-write this if there's anything to add.