Well the balance between the fleets is a lot closer then in previous editions despite the bits we missed (Aquans with indestructible SRS, unmanned smalls that are immune to cyber attacks, etc). There have already been discussions to FAQ the few problems that have popped up.
The new weapon types add some great individuality to the fleets and entirely new tactical flexibility with their coherency effects and increased ranges. Indirect weapons (torpedoes and such) are greatly improved with excellent ranges and the ability to shoot through terrain unimpeded. Mines have also received an increase in effectiveness due to their new ability to link.
Boarding and wings (SRS) have both been streamlined. Boarding is much less all or nothing and yet can still be a valuable tool either through their ability to target specific systems or capturing properly prepared ships for bonus battle log points. SRS all have valid purposes now instead of just being bombers, interceptors, and the other stuff no one takes.
Game setup is pretty self explanatory and quick. The new scenarios are pretty fun and the bonus objective set adds some cool randomness (or they will when theyre released, spoilers...
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All in all Ive been pretty pleased with it so far