I find they
[solderless breadboards] save time.  Not so much because
 it's faster to build something that way, but because it's a lot
 easier to do experimental stuff that way, stuff that involves lots
 of test-change-retest cycles, 
 That actualyl is one of my dislikes of them.  They
encourage 'fiddle
 until it seems to work' designing, 
 
That's not what I'm talking about.  Any tool can be misused, and that
is a misuse of this one - nor is someone who engages in that sort of
design likely to be deterred by having to solder and re-solder.
I'm talking about actual experimental stuff, of the "let's see what
interesting tricks I can make this chip do" sort.
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