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Yeah - I think it's sort of a combination blade.
This looks like a decent set to pick up. It's fine on kerf thickness (min 2.4mm according to specs) but it's 4mm smaller on diameter (205mm vs 254mm) - can't see any reason why that would be an issue..?
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Assume you mean 250 vs 254. Nope, other than you will lose 2mm of cut capacity. The 24T from that set is the one I have, I think you will be happy with it / them.
FYI, Freud have updated their line and those blades are now superseeded by these:https://www.ffx.co.uk/product/Get/Freud-Fr23W001T-4059952521732-250Mm-X-30Mm-X-T24-T40-Table-Saw-Blades-2Pk
I don't know if they have gotten better or worse, the anti vibration slots look more contemporary...
Max I have is 60T (freud). Is great for cross cutting in terms of leaving a very fine cut and minimising tear out, but not so good for ripping. More effort to push through, slower and more likely to burn your work, and finer more airborne dust. I generally only use it if I am doing some cross cutting and really am afraid of potential tear out. The rest of the time I use a 24T (also freud). While the teeth are sharp even cross cutting leaves a near perfect splinter free finish.
I've never tried a 48T (I think this is what they call a combination blade?), but if I was going to go for one blade to rule them all I'd be tempted to try one.
80T seems overkill.