How complex should practical DCF applications be on the buy side/sell side. See the example here:
https://www.dropbox.com/s/k1d04w8wbs6qcpf/NYSSA%20IRC%20BITS%20Model.xls
Obviously they are modelling virtually everything in the example given (this was taken from a WSO member who used it in the research challenge hosted by CFA this past year). When evaluation a company to invest in do you rather want a simple valuation model or one as complex as the one chosen.
Also, he seems to breakdown every business segment including R&D, and taxes for each. Where do they typically find the info. The companies I have researched seem to just show sales and gross margin for their various business segments.