how long have they lasted?
The woman that runs a baby shop in town always says MF is finicky and lasts "6-12 months" in her experience before it needs replacing. Meanwhile, I'm sitting here with 2 year old inserts that still work. They look like hell, and with a toddler I always double up with a natural fiber, but they're still functional. I think she's just trying to upsell.
Re: If you DO use MF inserts
LO is only 7 months, and we've been using ours for 6 months. My SoftBums and RaRs still look brand new. My BG are starting to look a little bit used, but still fully functional.
I have MF towels and washcloths that I've been using to clean with since 2005.
I agree, she's definitely trying to upsell. Why not just tell the truth and use the angle that as baby grows you'll likely need some natural fiber to handle the increasing pee?