This book is fantastic and very well done, with great art, layout, and clear, understandable rules. It borrows heavily from D&D 5e's Player's Handbook, but with a sci-fi theme throughout. Though there are only 8 classes, there are more archetypes for some comparable classes than in the PHB. The best part in my opinion is that EG is totally compatible with D&D 5e rules, and monsters are totally interchangeable between both systems. There's absolutely no reason why you can't have a D&D 5e barbarian fighting along side a Warrior, while your party's Melder and Cleric and slinging spells in the back. My players and I switched over to EG from Starfinder and it's not a decision we regret. Space combat even makes sense because it's treated very similarly to regular combat. I can't wait for the other two core rulebooks to release (Master Technician's Guide--i.e. the DMG--and the Threats Database--i.e. the MM). Overall, great fun!