Joseph
The Siemens 2000 was very much a professional model with quite a few variants, beautifully made and very heavy. If you can find one in fully working order it might be a great machine to own. But for normal use it may not be suitable, probably more for a static installation.
I have a Kodak Pageant and an Elmo 16-CL. Both very nice projectors, the Kodak takes more time to set up as it has a separate external loud speaker. The Elmo is a much more useful projector as it is a one-piece unit with a built-in loud speaker. Also, as it is a slot-loader, the threading is very quick, and it also has the advantage of being able to remove a part run film in an instant. It can also rewind through the projector.
Hope you enjoy your Elmo.