IMO, the problem with ANY estimating is the updates....how often and how accurate.
The HD WS CD, while completely frugal, can be updated daily - a HUGE plus...but how is the accuracy?
I suppose I could "order" my material from HD ~ but that's not likely as I dispise HD (another thread, another rant).
What I have found my self doing is generating my estimate with either TNE or HD WS CD...getting an accurate wire take-off, then calling the supply houses. Still a PITA.
Here's an example...250' Romex:
Item * HD * SH
14/2 * 51.58 * 44
14/2 * 72.43 * 49.50
12/2 * 78.22 * 67
12/3 * 112 * 111
I updated pricing from HD on these items, then called Cooper...lowest price is BOLD. HUGE difference in pricing(except the 12/3???)!
For larger wires, you really need accurate pricing. If I were to use the HD generated figures for the RX, I would probably still get the job - while "enjoying" a safety margin on prices. I am not about to call the SH every time I do an estimate.
If I were to try and use this tatic on a larger project(or a house of gigantic proportions), I probably would NOT get the job. For the larger jobs, I'll call on pricing and add a "price volatility" clause into the contract.