The sound of the Anthem is quite similar to the Pioneer in some respects, but as good as MCACC is, the Anthem's ARC EQ is superior, mainly because it will EQ down to 16Hz, and you can also set a upper limit on the frequencies you want EQ'd - personally, I don't see the point in EQing higher frequencies as this can be detrimental, so this is a useful feature.
The main difference with the 710 over the 510 is its toroid transformer, which gives a little more 'on tap' power and improved quality.
And Ben. Oh Ben. You could always get in touch with me to find out some facts rather than making assumptions and posting them as sly digs
The deal was always that L Sound were European distributors (that includes the UK) - that hasn't changed. What has changed is their need to promote and sell other products they deal with in the UK - we were never interested in their other brands other than SVS which we also bought from them, but that all changed when Karma AV became UK distributor for the brand. It's just business, there's no ill feelings.