The stability of the solution is good. I rate it nine out of ten. 

The solution is very stable.

The solution is stable.

It is a stable solution. I rate the stability a nine out of ten.

This is a stable solution. 

I would rate the tool's stability a ten out of ten. The solution is rock solid with no issues.

My impression of the stability of the solution is that it is quite good. We've had a few issues here and there, but it's always been minor things. Stability hasn't been a big deal.