While it has been "discovered" already (see this thread
https://forums.frontier.co.uk/showthread.php?t=104497), it is worth the travel time to visit!
One sees this weird little cluster of very bright stars from a long way away. I saw them first time when mucking about in the Horsehead Nebula region. They will still be visible even when facing a star coming out of a jump, that's how bright them O-types are. And when there, it is quite the wonder to behold.
So guess where I am now! Sniffing round NGC7822, wondering if I should head over to the Bubble Nebula or just draw a straight line towards nothing in particular and go there.

S
Yeah I would definitely recommend NGC 7822. It's well worth a visit.
I was actually on my way to the Bubble Nebula when, like others, I noticed that odd rectangular strip of very bright stars in the far distance. I didn't know what it was at the time and for many jumps afterwards I still didn't know but it was driving me crazy - every jump I was thinking "what the hell is that!?".
I eventually managed to locate it in the galaxy map and immediately changed course to check it out. It was well worth the course change! Lots and lots of very tightly packed O, A and B class star systems with LOADS of black holes, too. Very pretty systems and worth a few credits too, yes it's all already been discovered but it's still well worth a look.
I've still not made it to the Bubble Nebula because of diverting to NGC 7822.

It's still on my list of must visits though because it does look awesome on the galaxy map.
EDIT: One thing to bear in mind if you do head out to NGC 7822 is that it's located quite near the outer edge of its galactic arm, and therefore as you get closer to it, there fewer and fewer stars so unless you have a ship with a decent jump range you might have trouble reaching it. As I got closer in my Asp, I was having to plot shorter and shorter jumps in various directions to get a round about way towards the nebula as the stars were so sparse it was just too far out to plot a long straight line jump into it. Made it eventually though, and once you're there all the systems in the nebula are only a few LY apart as the nebula itself is pretty dense.