I second this recommendation. I've been playing on their site frequently and they have by far the fastest built-it bot I've ever seen. Even on my relatively low-powered internet connection, I get about 5 rolls/second.

Also, they are a partner of MoneyPot.com, so you can be sure that they won't (actually they can't) steal your funds or fudge the rolls outcome.

Give them a try, you'll be pleasantly surprised, I know I was. They're fairly new but have a really active dev team and add new features all the time; also one of their mods/devs is usually available in chat and always very helpful.