Wondering about forming Delaware Series LLCs in California

Has anyone started up and run a Delaware Series LLC in California? What are the pros and cons? It looks like having the "series" which allows many LLCs to be operated under one umbrella LLC would be much more economical than operating a bunch of California LLCs, in terms of paying taxes on each LLC, accounting time and fees, etc. Since California does not provide for formation of series LLCs but does recognize foreign series LLCs, is this the best way to own many different properties, each in a seperate shielded entity under an umbrella shielded entity? Or do you end up paying taxes in Delaware and California making it more expensive?
Thanks in advance for sharing your experience on this.

PS. I'm a lawyer, experienced in forming California LLCs, and Delaware C-Corps. Just not this other entity. So I dont need basics explained.