@Bird Thanks for your feedback. I think we have come to the same conclusion. There are a few higher ups who will balk at the fees they will have to pay, but they will probably find it hard to argue with the math if I present it correctly.
As for Guideline, I've shopped around quite a bit. We received Proposals from over 10 companies including Vanguard, Fidelity, a few insurance companies, and a few other Silicon Valley start ups. I've done some thorough research into Guideline including looking into their founding team and contacting their current clients and they seem to be top notch from every angle. If you are curious about cost comparisons from my research I've laid it out here: https://docs.google.com/spreadsheets/d/1kC3t72lt5h_JChpr_hFeCi6mri_9uLINFRDMLlw8JfQ/edit#gid=0 These numbers are based on 2M and 4M AUM.
Their youngness bothers me as well, but I figure under a 401k plan structure it shouldn't be too hard to wrap it up and move it to another vendor if things don't work out there.
@MoJo We have tried renegotiating with MetLife, but they came back with an offer still significantly higher than any non-insurance companies. We are no longer interested in bundling insurance with retirement investing. Thanks for the suggestion though.