Hm. If you're referring to the Hammond SK1, etc., those aren't really arrangers. I love their key action, portability, and light weight! They also have auto harmony (i.e., add notes to RH based on the played chord.) Unfortunately, they lack the "one finger triggers a major chord" left-hand functionality of the Hammond XE series from circa year 2000. And that's something I personally can't live without. So close... :-(