We are starting to move to 4950's from 5698's. We don't have a need for uPOE, nor F-to-B airflow.
We will miss many 'legacy' features of the 5500/5600 series, but fabric more than makes up for it and is what we hope to deploy in the future.
Also, the heat load is similar between the models, while the 59XX has a higher thermal envelope. This can be a problem in some of our closets.
TankII