I haven't used heritage in a few years and was considering reupping there but offers like this scare me, it usually a warning sign when the offers look too good to be true
The offer is still decent, but would be beyond great... if you could bet the balance in one shot.
The details seem lacking. If you deposit $1,000 and bet $300 and lose, is your next limit $300 or 30% of $700 ?
What if you bet $300 on a +300 dog and win, for a $1900 balance, is the limit $300, or 30% of $1900 ?
You'd want to lose ( win elsewhere), to get the $1,000 put back into your acct, then repeat.
I'm not doing it, but I could see a new player trying this respected book.