I’ve had a ton of fun with it.
Get the Rebellion version, specially if it’s on sale. It has all of the features of the core game + expansions with additional new factions and improvements to elements present in the core/expansions.
It’s a real time 4x game with more of a focus on combat than most other 4x games.
There are lots of tactical options in terms of warfare, from various ship designs, to star bases to planetary defenses, and while there are lots of non-combat related research and diplomatic options, these facets don’t have anywhere near the depth of say a civ.
I love sneaking through enemy defenses, warping in a huge fleet of ships through enemy lines and laying an enemy planet to waste before the enemy can respond.
On larger maps a huge empire can get a bit tedious to manage though.