I haven't used the site you are speaking of so I cannot comment on it.
I can't play
online poker anymore where I live, but I used to play on FT Poker before Black Friday hit.
The software I tried out was called the Sit N Go wizard. It was excellent.
I initially made several small deposits before using it, and only broke even, didn't know what I was doing wrong.
The SNG wiz taught me how to play properly after 90 days studying and practicing with it, about 4 hours a day.
I went back on FT Poker and won $5 in a freeroll, and in a years' time turned it to just shy of 3K.
It's grinding poker, you aren't going to get rich playing 9 person S&G games, but armed with the skills learned from the S&G wizard, you will win long term.
ROI is usually between 14-15. Build your bankroll up slowly, and then when you have at least 60 buy in's for the next level up, move up in stakes. If you run into variance, once you're down to 60 buy in's for the lower level, go back down. I only had to do this once.
Once you get comfortable with making proper decisions, you can play 4-5 games at once, increasing your bankroll a good bit quicker.
It really boils down to what you want to do playing poker.
If you'd rather play a tourney that could net you a big payday, then play MTTS. There will be a lot of variance playing these though. Don't play these for more money than your bankroll can handle.
If you'd rather grind out a bunch of small wins, 9 person S&G is a game you can definitely beat with proper strategy. You only have to beat 6 players to finish in the money.
Cash games can also be grinded out and produce long term winnings, though they have more variance than S&G, but not as much as MTTS.
Pick one and apply yourself to becoming as good as you possibly can.