As I understand it, according to what I've found online...
The first four bets are a one step parlay, and the following 5 bets are flat betting for two wins in a row. The book can be a bit confusing about how to determine your bet size. There is imo a slightly easier and more important way to make that determination if you are going to play it by the book I found online.
The System consists of 1 profit bearing progression, with 2 recovery progressions to get you back to the first progression. They are as follows.
1112 | 5 10 15 25 40 = 100u
2224 | 10 20 30 50 80 = 200u
66612 | 30 60 90 150 240 = 600u
That's 900u. The book says your base unit size should be the first value after the "|" in the first progression, which is the 5. Now this eliminates $5 bettors in a B&M. I imagine even $25 bettors that can play the first progression at a $5 table would balk around the $450 bet let alone the final $1200.
So, look at the entire System laid out in full instead of just the first progression. And use the final recovery progression as a means to determine your base bet for the opening progression. Which is still going to take some pretty deep pockets for a B&M casino.
Personally, I think this system is dangerous for anyone under $250 units and they should still start out with a $5 opening parlay attempt in the first progression.
I'm still not on board with risking 100u for 9 attempts at two in a row. I would think a progression like Soxfan's or one more conservative would be better.
111 22 3 4 5 7 is a 26u bankroll for 9 attempts at winning two in a row with a profit of 3,2,1 2,1 2 2 1 2 Now the profit isn't on par with the Star at 3,2,1,3 | 5 10 10 20 30 However it is at 1/4 the risk. Even if you double it, and then double the whole thing again just like Star is written, you are still at 1/4 the risk with 234u.
There is a slight difference, as the final 5 bets of Star tread water with a WLWLWL pattern. Even so you could stretch out a 1-2 parlay progression 15 places for 153u. Double it after a bust and only risk 306u. (total 459u) That would be 30 attempts to win 2 in a row. And the Star System isn't exactly 27 attempts, because it is written to lump all four parlay attempts into one big bet for the first time you enter into the second and third progression.
There comes an advantage with risk. The Star System does have increased profits for successful coups, so it takes less coups to recover in the second and third progressions. And any successful coups in the first progression reduce the impact of the inevitable bust. But it is a long precarious climb up a 900u mountain to bust safety.
Now, I have over 600 live B&M craps Pass/Don't decisions and not once did I fail to win two in a row in 15 attempts. Though it did go to 14 attempts once. (it's been reverse engineered) I'm not advocating its use, just illustrating just how robust it is. Which brings me to my final point of interest.
Soxfan has a steep 2 step parlay that is similar to the Star System where as he increases risk deeper into his progression he reaps larger profits. I'm not criticizing this approach but want to defend what some may consider a small reward of only 1u-3u for being driven deep into a progression. Where you are down 85u, parlay a 29u bet risking a total of 114 if you lose and only winning 2u profit if you win. Keep in mind it's not 'only' 2u, it's 87u! This approach of winning more the deeper you go does not take advantage of winning 4 6 8 even 10 or 12 in a row. As now with the first successful coup of two wins you are reset to the smallest bet and reap the smallest rewards. If your larger rewards are at the first bet stage, then these times when you win 4 6 8 10 and more in a row you reap the maximum profit.
I know it's not common to win 12 in a row, but 4 in a row isn't really uncommon at all, and it seems counter intuitive, or at least like you are playing with fire, hoping for some losses before you win in order to get the most out of your MM. If you would humor me a bit down gamblers fallacy lane..... If you have been driven all the way into the third and final progression, then things have not been going well for you for some time and you are (possibly) "due" not just some double wins, but (hopefully) more likely 4 6 8 or more in a row. And a progression that yields more with its first bet really shines here, when you need it most.
PS. I've come across some mentioning of E Star, but could not find any detailed explanation of its design.