The air chamber helps a lot with getting the bead to set when going tubeless.
I didn't look close enough to see that it is a screw-on valve connection - not my favorite. I prefer a quick-release for day-to-day needs, but the screw-on works fine for when I have to seat a bead.
Lezyne never disappoints. There is a learning curve as instructions are not the best, but youtube videos help you understand how to set the tubless tire before adding sealant. Tip, remove valve core, of course, from wheel valve, after installing tubeless tire. Then you cannot 'screw' on the head valve, although it seems odd, you simply hold the pump to the open core until the tire 'pops' adubily into place. then, add sealant at a 45 degree angle of the wheel, so that the sealant can flow down the interior of the tire, replace valve core, inflate, and you are done! Super simple. And as a daily pump it is nice and the inflation gauge is at the top, vs at the floor like so many, so easy to read. Great quality product, cannot go wrong if you do not have an air compressor and do not wish to waste CO2 cartridges for setting tubeless tires at home.
Bought the Lezyne Pressure Over Drive with ABS1 Pro; analog version. Now I have an easier time seating my tubeless tires onto the rim. Should of bought this in the first place, instead of the Joeblow Sport III, What was I thinking???