I don't necessarily regret the purchase. I feel I got my moneys worth. I enjoyed it for about forty hours. Then it became too repetitive. The learning curve is one of the best parts of the game. The exploration can be fun but gets repetitive though it is more of an added bonus/an extra way to make money by selling your cartography info. The combat is great, the best part of the game really. If you're not into it escape is not hard unless you are attacked while scooping cargo or other items that are floating in space. If you like the combat (to dogfight) the game will most likely be your cup of tea. If that is the main reason you are purchasing I highly recommend it.
The other ways of making money (space trucking/smuggling/mining) are fine but become repetitive very quickly. Your mileage may vary depending on the length of your play sessions I would imagine. I found myself playing through the night on several occasions and/or staying awake into the early morning hours when I had to be up at 5:30 AM for work the next morning. Any game that can make me miss out on sleep is good, no doubt.
At some point I just felt no compelling reason to keep playing after trying all the different careers and/or while buying several ships with their upgrades. Unless you are going to be a pirate or bounty hunter the game gets very repetitive early on. After trying the combat and hauling cargo around I tried mining. That was the last I played of it. Other than trying to catch the ore floating in space the process was beyond boring. Worst part? Finding a giant asteroid with the metal(s) you are mining then finding out there isn't even enough ore there for one unit of sale.
One of their main goals (and I read someplace it is on their list) should be making the storyline more prevalent. If you spend enough time reading the news posts/bulletins at the different ports/stations you can piece it together and enjoy it for what it is. But if you're mainly in the game for the action you won't even realize there's a storyline and a struggle for control.
I am looking forward to their FPS add-on and being able to land on planets. I will definitely be back to see how that pans out. But at this point in time I am so very happy I didn't buy a new HOTAS and the Oculus Rift to play this. If I was still into flight SIMS I would already have them, sadly I am not. I know some of you will argue the game is ten times more immersive with the proper peripherals, I won't even try to fight it. I plan on getting them in the future and possibly changing my tune. At this point I was playing with K/M and a XBone controller (no I didn't buy the XBone just a single controller), which I found to be more than adequate and completely enjoyable. So watch a few videos and if you think it may scratch that itch buy it. Odds are you won't regret it.