As someone just joining the business and trying to decide on joing an association (or not) I have come to this conclusion - <Inter>NACHI seems to be more of a "marketing" and sales organization> I haven't quite figured out what they're selling ***snif, snif, I smell snake oil***, but it costs $289 and then a bunch of stuff is free.
The other two, from what I've seen here, (Not seeing the other message boards is kind of a negative to not know the types of people or leadership an org has), really don't like NACHI.

Can a member of each ORG answer this -
How is the leadership at a national level decided? Appointed, Elected or Birthright?
How often are the leaders (Pres, VP, Treas) changed?

Also, I'm leaning against <inter>NACHI for alot of reasons, but one that others may find interesting is here
Real Estate Agents | Move In Certified

I wont ruin all of the details, but here are a couple things I found interesting about having <inter>NACHI do a seller inspection...
This was in the "agents" section (emphaisis is mine)

Something about recommening certified <inter?>NACHI inspectors instead of "being at the mercy of buyer's choices in inspectors".
God forbid the sellers >>edit: buyers<<get to choose their own inspector

Sellers "assisting" inspectors during the inspections.
Gee, i hope they at least took <inter>NACHI's on-line exam first. Or perhaps they can explain how the double tap is ok because its been that way for 15 years, no need to report it...thank for the assistance

And if it does end up in your report....
"Sellers can have inspectors correct any misstatements in the reports before they are generated."
Hell, why don't they just have the sellers do the inspection AND the report, take the 15 mins for an online exam and pay NACHI rather than an inspector?

Don't get me wrong, I think sellers inspections are a GREAT idea, I just don't need the homeowners "help" with an inspection or report.
Note that this was in the page aimed at getting Agents bouhgt-in.

Just my five bucks-
Jimmy