Ive been playing the 5400 FPP sattys for the last couple months and like them. I know the variance is high in them, but I think its way better than the gold bonus. I'm currently at platinum status and I still play them as I still believe its better than the platinum bonus. Another thing to consider when playing them vs taking the bonus is that you have to play a certain amount of hands to clear the bonus. You don't have to clear the satty win and I trade the 215 T$ to $208.55 cash through a website (easy to find, just google sell PokerStars
As for the competition in them, it varies. Once I had like four 50/0 type players at the table and once I had all 16/12 types at the table, so it really depends on who registers. I'd say on average theres 2 really bad players in them so I think that getting a cash rate of ~45% in the long run is sustainable if you are a good player.
So if you sustain 45% winrate in these, u win approximately $93 (assuming u take cash instead of T$) for 5400 FPPs u get so you make 1.7c/FPP.
If you take the Gold Bonus ($285 for 25,000 FPPs) you make only 1.15c/FPP so you dont even need anywhere close to a 45% winrate to make it more profitable to play the sattys.
If you take teh Platinum Bonus ($600 for 50,000 FPPs) you make 1.2c/FPP so you're still much better off playing the sattys imo.
I hope I did those calculations right, I'm no math wiz, lol