I did LL with Dr. Betz back in 2012 and took my nails out about in the end of 2013. I did 9,5cm on the femurs (9cm on the left, 10cm on the right); I went from 5'5''to 5'9''. I had the 11mm Betzbone (the older model) and had to use crutches during the whole process until 9,5 months after surgery. My weight was 62kg back then (I'm 74kg now).
I know some people had problems with Betz but for me the LL was spectacular. I hated to be on crutches but the extra 10cm changed my life for the better. My only regret is that I didn't do this 10 years before.
I've recovered 99% and I'm as fit and muscular as i was before (and my tights are epic now...lol). The 1% that I didn't totally recovere was part of my flexibility, but I had an above average flexibility so it doesn't bother me much.
Having said that, if Stryde is really weight bearing without crutches maybe that's a better option now.
It would be nice to have Betz as the surgeon and Stryde as the nail.