I'm trying to figure these things out. It seems to be a cross between a pension and a 401k. Does anyone on here have any experience with CBPs?

They are in fact a cross between pension and defined contribution (i.e. 401(k)) plans. Depending on what is desired, they can achieve the best attributes of both types of plans. If the goal of the retirement plan is to seek higher contributions/higher tax savings, they are usually very attractive. They can be a big pain if you over/under shoot the return assumption over time.

We have a DB plan. They are best for single member or all hce businesses and for older owners. High fee, but a lot of ability to stash a lot of people quickly. If you have employees, you may need to contribute for them.

It is absolutely not a diy plan. Talk with a good tpa, ideally the sa,e one that helps with your 401k.

This is a good "enough to be dangerous" blog post, but it may clarify your suitability to an extent.

https://www.whitecoatinvestor.com/cash-balance-plans-for-solo-and-group-practices/