I never even heard from them, I think they are okay but I never used them, if I was you I would wait on some more reviews just to be sure it can be trusted.
You can never be sure enough these days.
If you never heard from them and there are no real reviews you can better just not take the gamble if you ask me.
I guess, HarryKPeters wanted to say that he never heard
of them, NOT heard
from them. In any case, as I stated above, I played at
www.bitcoinbetting.website. It is working as expected.
Okay, so there are already a couple gambling sites that work off this same concept (guessing digits of your transaction ID) as well as other options of gambling, so I guess it's better to check out those others before using Bitcoin Betting. That being said, the interface is clean and minimalistic (although I can see it being a little dull) and the functionality looks good. The website doesn't look like it's very populated; but I suppose that doesn't mean much for this kind of gambling?
TL;DR: Looks good, but there are plenty of different options with more features.