Flame Roll Out
What he is calling roll out. May be caused by vent problems as Houston said. This can be caused by the flue/chimney being too short. Too much gas pressure at the manifold. Dirty burners. Dirty heat exchanger, etc.
The ver 3.0 ECM is only being used on Carrier/Bryant units, as far as i know. Maybe ICP units have it now also. Since they are owned by the same company.
The first generation ver 2.3 and 2.5 didn't have speed limiting built into them. All new ones of those versions do. So they are not prone to early failure.
And the ones that seemed like they were. Were usually installed on grossly undersized duct work.
2 stage furnaces come in both ECM, and standard PSC blower versions.
If you have A/C, and live in an area that has high humidity in the summer. A VS ECM can help to lower your indoor humidity in teh summer.
Get a second opinion. But, at 20 years old. That unit is pretty much at its end of usefull service.
Its heat exchanger can probably be replaced. But, you would still have many other parts that could fail at any time.