Susan,
 As you know, I use the neti, and occasionally the Neilmed if I feel
like something's "stuck". I had used a water pik for years with a
self-made tip that now that I think about it was disgusting--while I
used the water pik I never sterilized it or the solution--so it
coincided with a time that I was really ill.
 A few years ago, a major surgery by a world renowned specialist, left
me with a pseudomonas osteomyelitis, and he literally refused to see me
back, because all of his patients had good outcomes. My personal ENT
saw me for weekly debridement in the office, and finally did two
subsequent surgeries. While I was really desperate, I bought a water
pik and a grossan head, and my ENT strongly suggested that I not start
it. It's clearly personal preference.
 I recently found that the Boston expert wrote a book on how to heal
your sinuses, with the help of a writer. Yuck.
 I once emailed the Boston ENT, after he published an article on his
successes, and told him he better have not used me as a success story.
He actually emailed me back--way too late, and offered to see me in
follow up (I'm sure after he called risk management at the malpractice
insurer...). I declined. He told me "to quit obsessing about what came
out of my nose--only it was dead bone. Hard to ignore.
 So, my personal rant aside. I just think everyone can benefit from
irrigation, and I'd love to know if there really was a "best" way, but
I think anectdotes and clinical experience will have to suffice.
Judy