they aren't that impressive. the 7414 is a very well built saw but power wise a ts420 spanks them. if I remember correctly with a blade buried in 4 inch concrete dry cutting they will hold around 7k rpms. I did some side by side comparisons of ts420, k750/k760(cant remember which it was), and 7414. rpms in the cut and the pressure you could apply while cutting the 7414 lagged way behind a ts420 and was about even with the 750/760. 7414 is 73cc. ts420 66cc. we even tried muffler mods on the 7414 to wake them up. dual port muffler mod and that slr chamber removed they gain some power but still not quite comparable to a ts420