Anyone made the dive to Lithium and had it in four seasons?

We have few members here, who are using them, but I see TONS of members on Sprinter forum who debate the setups to death.
Seems B2B charger is the biggest issue.
I read those topics trying to get on technology bandwagon, but so far my $100 batteries work fine and I have no plans to spend thousands.
Still waiting for the prices to drop.. by like 5-fold.
For Sprinter topics go HERE