I was suspicious of the fairness of the doubling on English Harbour's video poker. So I deposited and carefully recorded data for over an hour, doubling after every win, except I collected any large wins, and recording for each double the result, win, lose or push.
I played until I lost all my money (playing 4 line, single coin, recording wins, losses and ties on the doubling game (I did not record the video poker itself - I was only concerned with the double).
According to my data, it is 99.999% certain that English Harbour is not offering a fair doubling game in their Tens or Better video poker game.
Although nothing is completely certain, 99.999% would be good enough to convict a man and sentence him to death, so I think it is good enough for any reasonable person in the world to be satisfied that English Harbour is a cheating casino.
Here are my results:
84 wins
151 losses
19 ties
Ignoring the ties (which push and therefore have no effect), there should be an equal number of wins and losses on the doubling game.
As you can see from 84 wins vs 151 losses, there were not: the results were hugely skewed in English Harbour's favour.
By use of the binomial theorem in Excel, =binomdist(84,84+151,.5,true), it appears that the chance of only 84 wins out of 235 trials with a fair (50/50) game is only 0.0000074.
Accordingly I recommend you AVOID this casino and the others in its group, as although I did not find any problems with the other games, I did not feel inclined to test, and a cheating casino is a cheating casino, so if they are cheating here, they could be cheating anywhere else.