I bought a 500 combo for shooting with the boy scouts about 4 years ago and keep the HD barrel on at home. I love it. The stock fits me much better than an 870 so felt recoil is much tamer. I added a light tube sight to the long barrel for my old eyes and to teach scouts about sight picture (Can you see the red glow? No. close you left eye... OH THAT red light!) Works great!
It does not feel as substantial as my 870 but is half the price and clearly good enough. I score as well as I ever have at trap with it. The shots i miss are due to my wandering focus. Thankfully I have not started to drool yet...