"ARWadsworth" gurgled happily, sounding
much like they were saying:

How much difference will it make to mix and match my USB chargers?

Some are rated 1A and others as low as 0.1A.

Can I just leave the 1A one in the socket and plug whichever USB lead
and device I want into it without worry?

Yep.

USB on a computer usually puts out either 500mA or 100mA, with the device
"selecting". If you've got an unpowered hub, it's 100mA max. Stuff like
USB-powered scanners or HDDs needs more. Some phones need more to charge.