Service - what service? Hostile staff.

Good points -
Reasonable swift despatch
Godd price on product - but do watch for silly prices..
Good product (Pioneer), but that's down to Pioneer not 'cac' - perhaps the company name should be cack.....

Now the BAD.
My query - about fiddly initial startup process, was met by "We only sell products and know nothing about them; contact Pioneer directly. Not our responsibility.
CAC are retailers so all queries must be handled by them. Their T's and Cs avoid any care by virtue of the fact that they make extortionate charges at whim.

If you know whatever product you want to buy INTIMATELY and it's on offer at a genuinely good price, then buy from CAC. Otherwise look elsewhere.
(Such a shame because with a little effort they could be so much better.)