I haven't been diving nearly as long as most all the divers that frequent this forum. Almost a year and loving every minute of it. I started with a lot of unknowns about gear and relied on the advice of the LDS about what to buy and use.
I bought standard/usual equipment sold by the "experts" and thought I was doing a good thing.
After diving the gear a few times and having some minor trouble with trim and buoyancy my attention turned to this board for information and more opinion.
There are those that resort to rhetoric that may not be the most productive means of spreading the message. The DIR acronym is probably an unfortunate use of words and does imply that others are "doing it some other way but right".
HOWEVER, the equipment is awesome and does what the proponents say it does. Unlike some of the other claims that equiment manfactures use to describe their gear.
I agree that some of the gear is expensive, but like in everything we are exposed to: You get what you pay for!
That said, I have the BP&wing, long hose and bungeed octo. I am enjoying the difference it has made in my trim and buoyancy control and am looking forward to learning more about diving in the future. I have not taken the DIRF class (local event got canceled) but I am looking forward to that as well. Albeit with a bit of apprehension of the unknown.
Try it, you may like it. If not, then hey, no sweat I wouldn't take it personal.
YMMV