Review (2/5): Broke on first use
We have a Wahl Sterling 4 clipper. It's a good clipper, but the set of guards that comes with it doesn't include a 1/2 size. The plain plastic 1/2 guard is stupidly expense for a single cheapo item, so I opted for this once, which is supposed to be nicer and more durable.
Unfortunately, one of the teeth (tines?) broke off on very first use.
Also, my clipper just seemed to have a harder time cutting with it. It took my wife over 30 minutes to shave my head, versus the usual 15 with the size 1 guard. Even going over it dozens of time, it still feels uneven. I wear the one-length-all-over-including-beard hairstyle you might associate with Jason Statham. So I usually trim my beard with the clippers, too, to get the same length all around. And this guard did an absolutely horrible job there. (Again, my size 1 guard does just fine.)
Pros: Feels solid and looks pro. The metal clip goes on easy and holds solidly in place.
Cons: Again, broke on first use. Produced a noticeably poorer cut.
Overall, very disappointed. Expected better quality from Wahl. (And I inspected it before use, I didn't see any damage from shipping, so I think the plastic is just weak.)