I had serious squat form problems back in mid 2013. Koing suggested I do a better warmup stretching routine, as well as get some Olympic weight lifting shoes.
I started all over with the bar once the shoes came in. This was by choice. They felt strange at first but once I got the hang of it, I noticed my form was a lot better and I finally was moving weight up. Knees didn't hurt anymore either. FWIW, I'm quite tall and have long legs, so I stand very wide and point my toes out 30-45 degrees.
Good job!
You shouldn't get the shoes to compensate for mobility in your ankles. You should be able to squat deep without the shoes as with them. Don't do the plate thing. If you go heavy you can roll on the plates depending on their discs shape. Stretch more before and after training and on off days.
They aren't squat shoes really. They are designed for weightlifting. Snatch and Clean and Jerk. The heel is rock solid so it doesn't compress and you can put more power in to the ground.
Adidas weightlifting shoes = narrower and lighter than Nikes. I have ones from 1999 (wore for 5yrs), 04 AdiStars with a wooden heel (wore for 3yrs)
Nike Romaleos from 07 (7yrs of usage and still going strong) and 08 (a few months, I use to keep them at work to just squat in). Romaleos 2 from 2014 (current pair) These are wider than the Adidas shoes, a bit heavier but give more support as the sole is slightly wider.
Heel heights are pretty much exactly the same between the two.
There is very little real difference between the shoes from day to day apart from comfort depending on if you usually wear Adidas shoes or Nikes.
I have had a few friend with Do-Wins and they don't seem to last as long. You probably will get 2-3yrs with training 3x a week in them.
I've seen a lot more of the Adipowers from 2012 have holes and rips in them from lifters. Probably about 5-10% of the people I know with the shoes get rips in them. Nikes I've never seen anyone have holes in them. The whole is usually wear people have their little toes.
If you have the money it's worth buying imo. Get what you can afford as it'll make a big difference in training IMO. I can't remember the last time I squatted in trainers. I did back squat 150kg for 5x5 in flip flops in 2014 though. Flip flops are safer to squat in than running shoes.
The shoes will last many many years and it's only cutting back on a few drinking session for most people.
Koing