Problems with Betsoft are some serious issues in the past. Although, must admit that they do have some very nice slot products in the terms of 3D graphic, animations & story, trust issue still stands up.

Some years back, there was a jackpot scandal where progressive jackpots weren't paying out at all. (https://bitcointalk.org/index.php?topic=1531232.0)
And although a decade ago, there was a scandal with completely rigged Keno play at Absolute Poker.