Ximula and Alumix or sister companies. If you noticed closely, Ximula is spelt backwards of Alumix [8D]
Price wise, Ximula is 30 - 40% more than Alumix, both are alumunium construction of the poles. Only difference is, Ximula shelves can be easily moved along the poles (means you can change with your storage needs in time) easily. You need some gear with Alumix to change.
Accessories wise, both are the same, classy, elegant and a lifetime warrantee. You can easily take them with you when you change houses but of course price is a premium , again depending on the kinds of accessories, wood/glass panelling, width, etc.
What I like about the system compared to others is it doesnt use any carcass, ie the normal ones need a construction of the wooden carcass.