I used to have a Samsung laser for quite a few years. Went through maybe three toner cartridges. Eventually it started slipping and I didn't bother finding out if there's a repair available and bought a brother laser instead. Worked pretty great otherwise.
Haven't tried toner transfer on this, but regular printouts are fine and it's much faster.
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BTW, I've had my Brother laser MFP for 11 years and still on the original toner.