It's awesome, designing ships especially are so much fun.

The early access feels good thus far. Constant influx of new contents, no game-breaking bugs that I'm aware of, backed with solid gameplay and mechanics.

Most realistic gun simulator there is
Only unfortunate thing is that the hostiles are only.... sausages...

Yes

Do KSP a favour and don't buy this thing

I've never feel so immersed in a VN before

I played in standalone version, so my steam playtime is waaaay less than it should be.

Pros:
+ The only sim where the feel of flight is there. Especially true for rotary-wing, where in other sims felt like flying on rails.
+ Extensive systems simulation and damage
+ Great graphics, Supports VR
+ Multiplayer

Cons
- Lots of small Bugs, though nothing exactly gamebreaking
- Will break your wallet in both hardware and software :p