My coworker bought the Iplay one and it wasn't great. First problem is that it was heavier than Taiwanese alloy ones that can be found all over eBay. Then, it had a strange lump on it where the steerer tube clamp bolts screwed into it. It looked like the bolts were to long and they had started to break through the other side when tightened. It was super hard to tighten the stem down to get it to stop rotating in the steerer tube as well. Lastly, both clamping areas were covered in black paint and contributed to the difficulty installing the stem on the fork and the bars in the stem. All around it was a pretty lousy part for the price. As I said, the cheap alloy Taiwanese stems are half the cost, come in more sizes and colors with better graphics and a lighter weight. They also look slimmer and lighter as silly as that sounds.
Oh, okay. I bought my stem (it was together with the handlebar and seatpost) from AliExpress for $73. No problem with this.
When I ordered my frame by XmiPlay, I ordered the headset (with extra shims), a spare 142x12 part, a chainsuck/stay protector and also some spacers for the fork/handlebar.
Sorry, forget to mention: order also the correct rear 142x12 axle. I have got mine from Peter (XmiPlay).