I've done a lot with Craigslist. A few things, IMO, though to do/keep in mind.
I wouldn't respond by email unless you have a great spamming filter.
When I sell, I say in the ad that I will not respond by email.
If you start the emailing games, many times you're wasting time & open to spam.
Request the party text or call you.
If you want to be more private - even with your phone number, get a Google voice # for doing CL.
Of course, don't fall for any offers to send you money and you ship it.
Cash cash cash
First come, first serve - holding stuff usually doesn't work.
Notsomuch for a longarm, but keep in mind the prices you see listed on CL for competing products are items that have *not* sold. At least here, good deals fly off of CL.
It's no different than the old classifieds in newspapers. 99.99% of people are good - no reasons to be paranoid... just be common-sense safe.
I have an iPad up on CL here right now - and I've had zero interest. But, it's an expensive one - and someone shopping CL tends to be someone that is trying to get something at a deal, of course.
I'd also list it in sewitsforsale (a Yahoo group) .
HTH