It is a stable product.

The tool is stable. I rate it an eight out of ten.

The stability is very solid and high performing.

The solution is stable. I rate it an eight out of ten.

I would rate the stability a nine out of ten because a few requirements still need improvement.

We have not faced any stability issues with Polarion Requirements so far.

The stability of this solution is rather good, but you have to consider that with the size limitation. If you have too many work items then you will not be able to work with it. 

It is not a stable solution, as we had issues with shared licenses.

The solution is very stable.

It is stable enough but if you would like to work with more requirement objects, then you will get timeouts. So it's stable, but not usable all the time.

It is a stable platform. I rate its stability an eight out of ten.

It is very stable.