Folding Bikes - Old Bianchi Folding Bikes - Any Good?

Hello all, new to these forums. I've been lurking around for a couple weeks and thought it's time I jump in.

Anyway, I've been thinking about buying a folding bike lately and I've seen the occasional ad on CL for 1970-ish Bianchis. Here's one from about a month ago that was asking $100:
http://img96.imageshack.us/img96/1772/bianchifoldie.jpg

Here's a pair that listed the other night for $250 (for both):
http://img253.imageshack.us/img253/4401/bianchipair.jpg

So I'm curious, does $100-$125 sound about right for one of these in half-decent shape? Is there something inherently wrong with these bikes? Are they ridiculously heavy or rust-prone or have some other fatal flaw? It just seems like the typical used Dahons list for a bit more, and knowing what the older Bianchi road bikes sell for, I'm curious why these bikes might no be so desirable.

Based on the first picture, they don't seem to fit the adult geometry of the modern folding bikes (like the Dahon you mentioned)

The Bianchis are like many other makes, that in Germany would be called a Klapprad. They are very heavy, only fold small enough to squeeze into a car (not really suitable for commuting), components are normally the cheapest on the market.
As 14R says, they are quite small in the 'cockpit' department, so if you are anything over 5' 8" it would look like a kids bike under you!
The reason these come up so often is that they are fine for popping down the shops & stacking shopping on the very solid rack, but useless for the daily commute.
Because they are older, people think they must be worth more, but they were made in huge numbers in every country and, due to their bulletproof nature, lots have survived.

Bottom line, pay a bit more for a folder that doesn't weigh a ton and that folds small enough to use on buses, trains etc.

Happy New Folding Year!