Who has had experience with utilizing RUBS to split utilities?

[Adam Juodis]

There are a solid amount of multi-families near me that are landlord pays all, or most, which is a deal breaker. I was looking into converting to sub-metering when someone mentioned the RUBS(Ratio Utility Billing System) to me. It sounds pretty ideal as each tenant pays their split of utilities in respect to square footage of their unit and how many occupants reside in the unit. 

It is legal to implement in the state of Illinois. I was wondering if there's any other caveats I should be looking for when it comes to utilizing RUBS? How do the tenants react to this system? For example, I wouldn't really be a fan if I were the tenant, since I always turn off lights not being used, don't take long showers, and don't keep the windows open while blasting AC(As examples), but having a neighboring tenant that isn't efficient with their utilities seems unfair.

I want to get a good idea, so when I'm analyzing these multifamily properties, I wouldn't have to account for the monthly utility expenses.