Vintage Air EZ Clips Opinions

I haven't used the EZ Clips exactly, but I've used a similar style with good results. They're called Burgaclips and are used on many OE commercial and agricultural systems systems (Cat, John Deere,...).
I get them through these guys, who I highly recommend: Cold Hose
They also carry one of the most complete selection of fittings I've seen, and at good prices. They will also custom fab hoses for you if you don't have anyone local to compress beadlock fittings (my situation) for a very reasonable price.