SULIFEEL Rainbow Roller Skates, 4 Size

I bought these (SULIFEEL), and also a pair of NEMONE Adjustable skates for my daughters. They enjoy the colorways they chose, and the light-up wheels look amazing.The adjustable foot cuff is clever and well-implemented.I was surprised at the quality of the padding at this price point. Feels 100% synthetic.That's where the good ends.You're looking at these because the adjustable-ness seems like a good value. It should fit a kids foot for 2-ish years, I am hoping. The adjustable cuff works well, and seems to deliver on that part of the promise. But the corners cut on the rest of the product make me doubt these will last long enough to even warrant adjusting the next size up.The SULIFEEL versions came out of the box needing adjustment. Multiple wheel nuts were tightened almost to the point where the wheel would not spin. The wheels felt very notchy, and would not continue to spin after flicking them.Loosening the wheel nuts with the included wrench (nice!) helped things a bit. They spin for a fraction of a second after flicking them now. The included bearings are stamped ABEC-7. At first I doubted this due to the notchiness (felt like there were octagonal-prisms instead of ball bearings inside), but spinning the bearings individually, they feel very smooth.The notchiness I'm feeling when spinning the wheel, and the resistance that adds to spinning them, is due to the inductor for the wheel LED lights. The energy for the LED lights have to come from somewhere, and since there's no battery, they rob the energy from the wheel spin.These aren't speed skates, so this is fine really. The NEMONE version implement this better (or luck of the draw here, since the skates look like they come from the same pipe), as there is no noticeable notchiness like there is on the SULIFEEL.The parts that are supposed to be rubber, (toe-stop, truck bushings) are hard plastic. Do not expect the toe stop to work anywhere but the sidewalk. The trucks do not turn, and the part of the axle (white plastic) that attaches to the kingpin (bolt) doesn't look thick enough to be up to the task long term. I predict this portion will develop a crack after this summer of use. (predicted failure point 1).The velcro strap is another weak point (predicted failure point 2). The strap is not button-holed around where it is riveted to the plastic, so I bet this rips through soon.The top strap lock mechanism is a metal hook that latches into a sprung-plastic part on the buckle. It is already showing wear (24 hrs), and one has already worn to the point of it not locking after a couple weeks use on the NEMONE pair (2 wks). This part could have been fiberglass-reinforced (or preferably metal, even pot-metal) to give the part a chance to survive a season (predicted failure point 3).All said, my girls like their skates. They both have them set on their smallest size right now, but I doubt these skates remain functional for long enough for them to need to set them at their largest size.