Router corner radius jig. Any good? Easy to use?

[pgrbff]

I'm often tempted to buy a set of these. Are they effective, easy to use?
Any of the new UK manufacturers making them?

 

[Spectric]

UK manufacturers making them?

If the UK makes 10% of woodworking tools and accessories these days I would be surprised, our expertise is now just import and rebadge eastern products.

I have also looked at these jigs, I like the Woodpecker version but these types of jig only do a few set radius's and sometimes you want more choice to suit a job. There is a guy who has made a very nice jig that makes these CRJ's in any size you want.

 

[pgrbff]

Sometimes I just want to tidy up a corner on a jig and they seem ideal. Just not sure they are as easy to use as they suggest.
Clever jig but I seem to be spending too much time making jigs at the moment. A jig to make a jig is a step too far for me.