These have been out in the United States for quite some time now, and there are a ton of other sites that have reviewed them, but I might as well throw in my 2 cents. Everyone's tastes are different, so if your tastes are similar to mine, maybe you'll relate to my take on these.
I have loved Skittles ever since I was little, so a new variety is extra exciting. I remember when Tropical Skittles were introduced, and I devoured those, despite my feelings about banana flavored candy (hint: negative). So, when I saw that the Crazy Cores would include flavors I typically like, such as mango, peach, and lemonade, they sounded pretty promising.
Mango Peach, peach with an orange core, had a tropical feel and a nice amount of tartness. Peach seems kind of neglected in American candy, and this tasted like a passable mix of peach and mango. It was my favorite of the bunch.
Melon Berry, which was pink with a green core, tasted berry sweet and not too melony. It was my least favorite, and just didn't have that tart punch that even the Wild Berry Skittles carry.
Cherry Lemonade was red with a yellow core, and the outside tasted like a cherry cough drop. That was a big negative right off the bat, but I did enjoy the citrus zing of the lemonade core.
Blue Raspberry Lemon was blue with a yellow core, and a little perplexing. The coating had an almost perfumy taste to start with, and that was downright gross. But it faded quickly, leaving a classic blue raspberry flavor (like Blow Pops). The lemon was mellow and sweet, and could have used a little more sourness.
Strawberry Watermelon, green with a pink core, was my second favorite. The strawberry was like a good sucker - bright and a little tart. The watermelon core tasted fresh and light (and fake), and it wasn't too sweet.
I am not sure why there are two flavors with lemon-based cores, but these Skittles were at least enjoyable. The regular flavors are better, but the Crazy Core concept was fun to eat. After my third Skittle, I could feel a sugary film in the back of my throat, which one of my coworkers calls The Skittle Spits. Just thought I should warn everyone.