I tested it and signed with them.
They propose me insurance alternatives when my contracts end. I am free to sign or not and I am free to change myself for another contract too (without signing through VZ).
Results :
Car 1 : insurer Zurich : I got an immediate discount of 268.50. The will propose me an alternative when contract end.
Car 2 : same config but saving is 89.20
RC and menage : I added an insurance for the electrical bike (sport equipment) when I changed from Zurich to VZ Pool insurance. Price dropped from 450 to 350 with a better coverage.