Really good stuff to hear, fasteddy!
A guy at work had both knees replaced a few years back. He had been moving pretty slowly, as a matter of fact. After recovery I asked him how the new knees felt. I don't remember his exact words. But he was enthusiastic and happy with them. And he did walk better, I noticed.
Sometimes these knee replacements don't go really well. --Your last one wasn't all that good, right?----- But it looks as though they're mostly a new lease on life.
In any case, I'm glad to hear that yours is going well and that you have reason to be hopeful about it.