I recently acquired a 90 degree APM100SD for a very attractive price from a friend that found it wasn't quite as sharp as his Takahashi FC100.
They are what inspired me to go for the 150SD since they have excellent color correction.
They are equal to my APM150ED in sharpness, but with no visible color in focus. While the 150ED has some color on bright objects, they also have two very well figured and matched objectives.
If the 150SD can combine the color correction of the 100SD with the objective quality of my current 150ED, then I will be very satisfied.
I wish you the best during your cataract surgery and hope you will get the most out of the views once healed.
I guess I wouldn't expect a binocular to be as sharp as the Takahashi FC100. For me, the two-eyed view would make up for a bit of loss of sharpness, although at times I do dream of big APO refractor and the images it would provide.
With my copy of the 150, under certain conditions, such as the limb of the Moon, Venus or Jupiter, I do notice a tiny amount of false color, but I have no problem tolerating this.
Sometimes I wish the 150 was sharper, but I've decided that a lot of loss of sharpness is due to atmospheric conditions, and also I've become convinced that it needs a little time for the temperatures of the tubes to equalize with the outside air. When the atmosphere is stable and transparent, and it has been out a while to equalize, it is really very good, somewhat better than the 100 Lunt. My deteriorating eyesight is probably a factor as well. Hopefully this will be better soon!
Just keep saving and looking forward to the day you can get one, and it may happen. That's kind of the way I got mine.
One bit of advice though, be sure you have a workable plan as to how you can get set up to use it easily. It is definitely something that needs to be permanently mounted, as it is quite a chore to wrestle up and down to mount on a tripod each time you use it. I've done it quite a few times, but it has a few small scrapes where it got against the side of the mount in the process. What it boils down to is that without a way to make it relatively simple, quick and easy, you won't use it enough to justify the cost. Mine stays mostly permanently mounted on a wheeled dolly I built for it. The dolly has some shortcomings, but it works well enough and easily enough that I'm using the big 150 a lot.
Now if this fire smoke would just clear out, I could use it some more!