Let me start by disclosing that I'm a massive fan of the Sins games, have been since the very first one.
What you get with Trinity is the original game and all the expansions, all for less than a tenner, a fantastic deal for those wanting to dip into this very popular game.
If, like me, you use to play the likes of K240 on the Amiga then you'll love this, it takes the concept of managing asteroids and fleets in K240 and magnifies it to managing solar systems across entire star systems. The size of the game is really hard to explain, but the developers have done an amazing job of allowing you to set up endless games of different sizes giving you infinite replay-ability.
Be warned there is no story mode, you just need to throw yourself in and pick up all the tricks as you go along.
If you've read about this and think it might be your kind of game I would recommend skipping Trinity if you can afford to do so and jump in with the newer game which does away with the Impulse game management and can be purchased on Steam instead: [...]
You can check out a review of the newer game here: [...]
If however you're looking for something under £10 that will give you weeks, if not months and years of gameplay then I highly recommend Trinity.