I had ruined the cheap caged ball bearings that came installed on my daughter's bike. The local bike shop said they can't even order these bearings anymore (??) and they'd need to order a new headset. I knew this would take forever. Ordered on a Saturday afternoon from Amazon, had it installed on Monday afternoon!!This was pretty straightforward. The bike in this case (Polygon Xtrada) had a standard ZS tapered headtube but a straight steer 1-1/8" fork. I already had a ZS44 for the upper but needed this ZS56/30 for the lower and it just couldn't have been any simpler. Pop out the old steel lower cup, press in the new alloy cup, pop in the bearing, enjoy. Some of these use a 2pc adapter to fit either straight or tapered steerers. I prefer the 1pc when it's available...just 1 less thing in the assembly to worry about.The seal around the split crown "race" is a nice touch to keep grime out of the lower bearing and I didn't have to beat it onto the fork...it just snapped nicely into place by hand. It's a small thing but the packaging is pretty cool, too, and makes it seem like something more than a trivial alloy cup and bearing. For <$20, this is well worth a unique unboxing experience, not having to fiddle with greasing ball bearings, reducing maintenance intervals, and preload on the headset is much easier to set.Good quality cup which fits very well, good seal, hopefully a decent bearing, decent price, and fun(n) packaging adds up to a great experience. Next time I need a new headset, I'll be looking at FUNN.I'd be interested in knowing how to buy just the 40mm crown "race" in case I change to tapered fork later and don't need the cup.