I bought one years ago but found that unless you kept the range really short I struggled, prolly fine up to a max of 25 yards so you need to pick your decoying sessions carefully.
yes i use mine often subsonics are better than normall carts and 25 to 30 yards is the optimum range ive got a 12 gauge hushpower aswell but prefer the 410
If you want to know all about the .410 calibre get hold of a copy of Tim Woodhouse's 'book' on the subject. It think it is called 'Scaling the North Face...'.