I myself have handled one at my local dealer. They are lovely looking and very light and the build quality seemed okay.The sidelever cocking did seem a bit flimsy but I dont like the rear bolt action of the S410 or the Daystates etc and I absolutely hate the FX Biathalon style levers. The HW100 is heavy and not particlarly pretty though probably a better rifle. The build qaulity of the HW is great but I hate the pressure guage position.
I think I'll continue to sit on my money until the S510 has been around a bit longer...