I've had a few dozen payouts from the sportsbook family (Sportsbook.com, playersonly.com, bethollywood.com, and a few others) over the last 10 years. Never had an issue. Of course, some of these were with Neteller years ago. I've had a few over the last few years, and they have taken 4-6 weeks as advertised. Sadly I've been limited at all these books, so I am working through a friend's account now.
Sportsbook gets a bad rating on SBR (mostly due to some issues years ago - I believe it was correlated parlays they got burned on - and they didn't pay to those folks). And most people ask why you would ever play with a book that takes 4-6 weeks to pay, but its a book that you can beat. I'd much rather play at a book I can beat and wait 4-6 weeks for payouts, then play at a book that is sharp with their lines and offers limited props.
You can beat Sportsbook's props, halftime props, live betting, and futures, it really isn't that hard, and if you need help, shoot GR an email.