Yes, the EchoCharge is a follower, i.e., it will follow the charging profile of whatever is connected to the house batteries. Presumably, EVERY CHARGING SOURCE, including your alternator, has a smart, multi-stage regulator. If it doesn't, it should.
The EchoCharge is still shown on Xantrex's website:
Xantrex Technology Inc. - Recreational Vehicles - echo~charge - Product Information
and it's still available from a number of sources.
I've had mine for five years next month, and it's been flawless in 24/7 operation. Ditto for those we've installed on customer's boats.
We've installed a bunch of DuoCharge's, too, and they've been very good as well. They cost about twice as much, but most people really don't need them. The EchoCharge is more than sufficient for most needs.
Bill