I have a couple questions if you don't mind me asking. You are just past 6 months post op now, where do you think you are in your recovery? 50%, 70%?? What was the the thing that surprised you the most about the surgery or recovery that you didn't expect.
At 6 months...hmmmm

...
I am 1000% better than I was before surgery:
1) I can walk non-stop without any real pain.
2) I can stand for at least 4 hours or more without pain.
3) Stairs can be a challenge depending on if I was just sitting down but if I am honest, it's just muscle stuff because we don't all routinely go up and down stairs all day. There is zero join pain. During the work week, I probably do 6-10 sets of stairs a day because my office is in an unfinished basement and there is no bathroom down here let alone a fridge

.
4) My hips don't ache and neither does my back. Not one bit through this all unless I overdid something.
5) My legs are straight so I gained 1/2" and my gait is perfect. It's easier to walk upright.
6) There isn't anything that I am limited to doing. Not like it stopped me right out of surgery but I am just a bonehead anyway.
The bad stuff:
1) Kneeling is still a challenge. I find it hard to kneel without knee pads and even then, the range of how far back I can put by butt just isn't there. It's about 95 degrees when kneeling. I can kneel in the pool all day long and get better range but life isn't living in a pool!
2) Twisting my knees is usually okay but once you pass the point it is okay, the muscles let you know for several days.
3) Any time I sit for more than 20 minutes I am sore when I get up and it takes a few steps to work it out.
4) I know I am not as strong as I once was but I am stronger than I was right before surgery.
5) It takes a long time for your muscles and bones to remodel to your new weight distribution and I suspect the bigger you are (like me), the longer that takes. I also think this pushes off some of the strength until that process is complete.
As far as the biggest surprise? The mental aspect. To a certain degree we all think we are going to live forever so we abuse our body. When it catches up to you and you realize you aren't as young as you used to be, that's a bit of a hit. For some of us, we came to that realization years ago and then all this surgery does is remind us of that. We don't bounce back like we used to and things are harder to achieve physically than they once were.
Not a single person prepared me for this journey or let me know what to expect. I did a lot of reading here but not everyone discusses this part of the process for any length. It's a lot of highs and lows. One day you feel great, the next 5 you beat yourself up because you aren't where you were 5 days ago. It's a slow, long process and keeping mentally in the game is difficult. I don't know if I could have done it without my cheerleader wife. She really helped on those bad days. Also, there is this forum and people who have been through it. So at least you can placate yourself that you are not insane.
I said 4 weeks out of surgery that if that was the best I would ever be, I would do it again - that's what a life changing experience it was. I feel a lot younger and my outlook is really good. So while in the beginning for a BKTR is very difficult, it's a small price to pay to only have to go through it a single time.
I hope that helps!