I have done 3 Mosti Mondaile All juice kits and have been very pleased with them. Once I had a "could of had a V8" moment and learned from PeterZ to siphon the juice out rather than the risky pouring the kits have worked wonderful. The instructions are a little convoluted (one size fits all) but with careful reading you can figure it all out. Plus there are instruction here on the forum.
In terms of the "concentration" kits the larger the volume on the kits the better quality that you are getting. I have been extremely happy with the WE Select Estate kits.