Well I went ahead and ordered the Aldi router. It's taken somewhat
longer than expected because the one they initially sent was missing the
cover for the bottom of the base plate. The replacement has now arrived
and certainly looks and feels like good value after a few test cuts.
Compared to more expensive routers the pressed steel guide fence seems a
bit lightweight but seems to do the job OK.
The guide bush has a rather unconventional shaped fixing plate instead
of the usual circle, this could be a minus point for a more serious user
because you're limited to just the one size bush but that's not likely
to be a problem for my fairly basic needs.
The guide fence can be turned upside down and fitted with a centre pin
to enable circles to be cut up to about 10 inch radius.
A rather odd accessory is the roller guide which can be bolted onto the
guide fence, apparently for following curved surfaces
<http://preview.tinyurl.com/y7zhxdlj . I would expect this will only
work if the imaginary line through the centres of the roller and cutter
is kept perpendicular to the surface of the curve being followed. In the
absence of any way of forcibly constraining this the router could easily
wander away from the desired path towards the edge of the work.
I also bought a set of Aldi's router bits. It turns out that these are
not accurately described on the website which gives the maximum speed as
30,000 rpm but they all have a maximum speed of 24,000 rpm engraved on
the shank and it's down to guesswork what number on the speed dial
corresponds to 24,000 rpm. But at only 10 quid they're a good starter set.