I bought one of these 4 years ago, have shot the snot out of it and it hasn't batted an eye (so far). Mostly CQ rapid practice with cheap bird shot but a fair amount of sessions with #4 buck (which is what stays in it, cruiser ready by the night stand) as well as several 25-40 yrd runs with rifled slugs.
$399 is high IMO - I won't say what I paid for mine brand new from Bud's; it'd make you weep but... that was then and this is now.