I believe it's still a problem because the helmet is not generally very different pressure-wise from the surrounding water. This may have changed, but that's my understanding from the one I'd looked at in USVI.
That said, my personal opinion is that someone who is not certified has no business diving (and I assume if they have pressure issues they're not certified?) and at that I don't have a high regard for most of our cert programs to begin with. I love diving and have encouraged alot of people to do it, but I think you need to give it the respect for safety that it deserves. I'm also leary of the rental equipment in many dive shops so that's something you'd want to check out as well. How easy would it be for one of those helmets to begin leaking? What's the backup system if that happens? What if there's a problem with the air supply?
I'm simply not a big fan of this or SNUBA.