My 2014 North Rebel pumps fine with the new valve just up to about 5 psi then the valve connector just pops out and I lose air. It seems just a little air leaks between the pump valve and the kite valve. It seems a better design would be a thing gasket so it locks tightly with friction.
I LOVE the high flow valves on any brand and have had no issues pumping my 2014 Rebels. I rarely bring a pump to the beach unless I'm solo and borrow whatever is around. I've pumped with all sorts and the only time I found one that didn't work was when only 2 of us showed up and the pump had a glued in nozzle (doh!) so I pumped my rebel using the wingtip deflate valve and had a great day.
I was reminded last week while on vacation and on a borrowed old Rebel 14m how much harder the old little nozzles are to pump big kites with. The simple solution that North and others now use, where any normal hose can be used, is awesome. So simple and quick.
Used to have Cabrinhas and while I haven't seen their new system, the older one with the special adaptor that needed to be screwed on and off and stored on the kite in case your pump didn't have one was less ideal. It's not a huge issue but it does add time and complexity when you're frothing to get on the water.
The only issue I can come up with for the 2014 North valve is if you don't screw the cap back on after deflating and pack up your kite, the two little nibs that stick up to help you manually turn the valve can poke pin holes in the kite canopy. This isn't an issue if you deflate only with the wingtip and leave the main valve cover on. Very minor once you are aware of it.