Hi Lluis,
Many thanks your valuable feedback.
Just one clarification here, I'm not taking about a Partner without SAP Support, these companies to switch the current SAP Support to them own support.
In addition you can have as many partners you want (Basis, Development, Application Support ...) but as you don't have contracted any support with SAP they cannot use the SAP support services for you.
In summary, if you have a problem in your SAP landscape, instead of open a message to SAP, you have to open a ticket to this company and they should be able to solve it by their own.
I know that it sounds odd but it is like that.
Actually my goal with this post is to raise all the risks and benefits, if there is any, of this model and above all to get the feedback from people that are working with this model.
Kind Regards.