I'm agree with you, it's very heavy, you'll get into trouble when you get out of battery or when you have to handle it(keep in your house, in the lift ...)
I've tried giant twist 1.1 with lithium, it's around 30 kg, but it liked me more than monty, better quality and power.
Now I'm waiting for the new giant models, the cheaper is twist express r2,
Bicis Giant / Giant Bicycles - Twist Express R2 W (2009), (1200 €), you can find it in all sizes, I need the large one (21''), but I don't know how much it weighs. If you are interested, your local dealer in Ferrol is:
Ciclos Roca
Carretera de Castilla, 283 - 289
15404 El Ferrol
Teléfono: 981313674 | Fax: 981313674
Flecc thinks that now sanyo motor is freewheel so less rolling resistance when no assisted.