Interesting, how long were you with them? Just curious because my experiences have been very different. I have been with that site for a couple of years now and have never won more.
The guy you responded to just signed up to bash them... this is usually a "red flag" in my eyes, perhaps a competitor trying to discredit someone they may be threatened by. It happens here all the time so I would be careful feeding into it.
What I learned many years ago, after being burnt through trial and error, is to only rely on your own due diligence. Look at the big picture too. Too many people try a service for a day and lose and automatically they bash, saying they suck. This is unfair to the service and the basher because 1 day, or even a short time, doesn't make a hero or a dud. When I do due diligence I look at how long they have been in business, long-term consistency in performance and 100% transparency. There are not many services that provide these 3 things but I found 3 or 4 that do and have stuck with them for years now.