RIM evaluation

Currently feels like I’m bashing my skull in to wrap my mind around this evaluation method.

I’ve done the research and while I know there are methods to get a quick and dirty answer with a bit of information from the most current financial statement.

I was fine with that method for a bit but I noticed how widely it swings depending on changing some of more of the inputs by only a few numbers. So scratching slightly deeper than surface level and I feel like I’ve opened a can of worms.

This leads me to a full RIM evaluation.

For anyone that uses this form of evaluation I have a few questions:
– Is most of this guessing? I mean I know you’d weigh analyst estimates, GDP growth estimates, market and company estimates, and market growth to get to a better number but it seems like most of the inputs for the formula are all “made up.”
– Is this method better to only look a few years ahead? Unlike DCF where growing cash flow makes sense for a company that has it as a reliable metric, this seems to not work as well after so many years, due to things like EPS, Net Income, and shares being “guessed” at, and having the patiently to snowball.
– If above are true, can this still be used reliable at least as a comparison for other companies in the same industry, or at least for trends for the current company?
– Any other thoughts on this as an evaluation model?

Thanks!