I saw one being ridden at Killingsworth & 72nd a couple days ago. Maybe that was the one?

Here's what I can remember about the BikeE E2 tandem:

BikeE seats were known to break
Rear air shocks were prone to leak
Lots of weight on that 16" front wheel
1 1/4" threaded headset is pretty rare
Drivetrain parts are a bit weird, but not too hard to replace. A friend has a set or two of unused BikeE tandem cranks.

Another friend brokers used recumbents for people. He's also in NE Portland- I can put you in touch with him if you want an evaluation from a "recumbent" perspective.