Full Disclosure - I have done freelance writing for Modiphius on the Infinity RPG
The Inifinity RPG uses the same universe and background as the tabletop miniatures game by Corvus Belli. The background is near future science fiction, with healthy doses of transhuman and anime influence. The universe was what initially drew me to the tabletop game - and it just screamed for an RPG. The background in the Quickstart gives you just a taste of the universe. Not really enough to give you a good impression of the depth of thought that Corvus Belli put into it for the miniatures game.
The game uses the 2d20 system, developed by Modiphius for a number of their other games, including Mutant Chronicles and the upcoming Conan RPG. The basic mechanic - called a test - is to roll 2d20 against a target of attribute plus skill. Difficulty is set by the number of successes needed for - erm - success. There are ways to roll more dice and to count each roll as more than one success, but more on that later. The important thing to know is that it plays quickly, lending itself more towards cinematic than crunchy.
There are two other in-game economies to consider: Momentum and Heat. Momentum is generated from "extra" successes above those needed for success, and can be spent on a variety of special effects on actions, or added to a group pool to be spent later. Some groups have reported issues with frivolous tests being used to stockpile Momentum - I have not, so this might be a function of GM style. Heat comes from players "buying" extra d20s for tests or from Momentum rolled by bad guys. The GM can use Heat for a variety of effects, like bumping NPCs up in the initiative order, triggering scenery effects, and other assorted mischief.
The scenario included in the pack is a solid instroduction to the universe and rules, though it starts a little slowly for my tastes. The pregenerated characters are likewise solid in abilities and background, even if a bit hackneyed for those already familiar with the universe. The PC sheets can be a bit hard to sort out, but in Modiphius' defense, they were done before all the rules were complete.
In short: a solid introduction to the background and game system - well worth checking out if you like the genre.