I bought a general contracting company with two partners from the owner in 84' and my partners and I recently sold it to several of our key managers.
It was the best financial decision of my life getting in, and a very good deal also (for all parties) when I got out.
The value in companies like this includes: any cash left in the business, the profit potential of any work on the books, the real and current value of all equipment and vehicles, and any real estate that is included. Things like "good name" are not worth much as who knows where it will go when the present owners leave? Good, reliable, repeat clients are worth a little more if you think you will be able to hang on to them and keep their business, but don't put a huge value on it.
All the finances have to be transparent, no secrets, no surprises and routine meetings to review finances.
Salaries paid should be commensurate with the industry norm for your region. Just because you are equal partners in ownership does not mean equal pay, the salary is based on your level of responsibility in the business .... for instance a field guy probably isn't worth as much as the company president.
Determine a set formula for owner dividend / bonuses. No money gets handed out to owners until the accounting is done and all bills are paid per a plan. We got fully out of debt before we took anything over our salaries, then normal distribution was 1/3 went to the owners, 1/3 to the employees, 1/3 stays in the business for growth.
You also need a firm exit plan for the current owner(s). They can't hang around forever taking a fat salary and staying on expensive company health insurance or that will absorb much of your potential profits.
There needs to be a reasonable pay-off plan. Employees buying are unlikely to have enough on hand to pay cash, and banks shy away from this sort of thing. Current owner financing the deal for a set time period is the most likely route to take.
Our last buy out deal probably took close to 7-8 years from the time we started gathering the group, got the deal done and they paid us off. This will take some time.
One last thing .... Don't haggle over nickels and dimes, such as we want this tool, but not this tool, the interest rate is 1/2% too high, etc. Take the whole darned thing lump sum and focus on the big picture which is long term business growth and success.