Hopefully a simple one, but has anybody had any experience using indexable carbide insert end mills for cutting keyways? I can buy a 14mm tool such as this one

for $45 and the APMT1135 inserts can be had very cheaply. I compare this to a 14mm four flute HSS end mill, (which will require sharpening through it's life) for $50 and the attraction of the carbide tooling is clear. I also realise that nothing is free in this life, so I'm wondering just what I'm missing? I did wonder how close the tolerances of the slot created would be as any tolerances in tool or insert could easily add up.
What are the thoughts of the more experienced machinists here?


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