LeighMo wrote:

As for the price...yes, if money is an issue, you can rustle up your own system
for cheaper. But a lot of people find compressed gas very intimidating. They
don't know what to get, or how to hook it up. It's worth it, for many people,
to pay a little extra to get a complete system, along with directions for
putting it together and "tech support" if you have problems.

I purchased one of these systems in July (inc. needle valve), and have
been more than pleased with it on my 29 gallon tank. I was willing to
spend a few extra bucks for someone else to figure out all of the
various fitting sizes etc. and save a day of driving from welding shop
to welding shop. YMMV.