I haven't ridden the SunRace enough to cause any noticeable wear. I think maybe 3,000 miles on the chromed 13-25 MFR30. Maybe the chromed finish makes 'em more durable, I dunno.

Some rides, like today on some climbs into the wind, I wish I could find the 13-28 version, chromed, but I can't find one in stock anywhere. Might need to order directly from SunRace.

The MFM2A 7-speed SunRace 14-28 freewheel has only a couple hundred miles on it at most. The six smallest cogs are browned carbon steel. The 28T big cog is blue/black steel, resembling the Shimano MegaRange style. But there's no objectionable jump between the sixth and seventh cogs. It looks more cheaply made, and developed a rattle. I couldn't loosen the lockring with a punch and hammer to see if I could snug up anything so I'm just gonna let it go as-is. But it should be okay on the errand bike. It doesn't skip like the MegaRange tended to when it wasn't paired with a chain specifically marked narrow.

BTW, is it true that freewheels 7-speed and up aren't as well supported as comparable 7-speed and up cassettes on the smallest cogs? Don't remember where I read that but it preys on my mind every time I stand to stomp up a climb instead of shifting down. I suppose if it was a serious problem big guys on the pro tours would have broken a lot of hubs and freewheels and we'd have heard more cautions. I'm not sure how credible that one article was. I doubt I'm heavy or strong enough to break anything anyway.