Review on High-Quality 5-Pack MYCARTRIDGE Compatible Toner Cartridge Replacement for Brother TN227 TN223 TN227bk: Perfect for MFC-L3770CDW HL-L3290CDW HL-L3270CDW HL-L3230CDN MFC-L3750CDW HL-L3210CW MFC-L3710CW by Mark Toth

I bought these to have spare toner on hand. It's a shame I didn't at least try them in the printer before the return period closed and then put them away. Tried all sorts of tricks to get it working. Nothing but disappointment. My printer just won't accept them. $65 wasted. So I took a chance, bought an IKong, put it in and everything is fine again. The printer accepts them normally. Lesson learned.