I did try out one of them and was unconvinced that it was (as they all claim) some altruistic programmer who just wants to steal from the lying cheating casinos and give to the poor greedy gambler. It looked tempting at first, but I have become too suspicious otf these types of sites. My moto is if it looks too good to be true then it probably is.

The three sites I have come across (and there are probably more) are 1. Cash Generation Pro, 2. Cash Targets and 3. can't remember the name now, but read on I'll come back to this.

They all have the same methodology: You must follow their system to beat the roulette table which can be summarised like this:

1. Place a small bet on Black i.e. $1
2. If black comes up the you have won, cool but, If Red comes place a $2 bet on black, if Red comes up again double your bet on black i.e. $4 until you win.
When you win start again this time with Red
3. You should only place small bets and when you get to about $400 leave the casino, don't get greedy you might arouse suspicion.

BUT the most amazing thing, is THEY DON"T WANT ANY MONEY FROM YOU... yes they all claim that you will be so pleased with the secret they reveal that you will want to donate...

So does it work, well I tried it in fun mode (without real money) and it certainly seemed like it worked, so much so that I opted to play in real mopney mode. However I didn't like the fact that they wanted my credit card details and would not accept PayPal. I also didn't like the fact that they tell you you should only use the casinos which "they have tried and tested" which happen to have links on their website. The whole thing smacks of a casino scam designed to hook you on gambling.
I mentioned above that I could not remember the third website name, that was actually the first one I tried, I have searched for it online but I believe the site is gone now, and I also believe that Cash Targets is it's replacement, that's because the wording is EXACTLY THE SAME. It's just a different site layout and supposedly a different person promoting this system.
Cash Generation Pro is identical just worded differently, again telling you to only place small bets and not get too greedy and especially reccomending specific casinos.

I would steer clear, or otherwise before you know you'll be sucked in and losing big time. This of course is only my opinion, take it or leave it.