I have both the Resp-O-Rator and a Breath Easy air setup. There are pros and cons to each, as with anything I suppose, but they're both at the top of the list of effective options for bearded fellows.
I do tend to drool a bit when wearing the Resp-o-rator. While the creator claims that keeping your teeth clenched together will prevent this, I've not really found this to be the case. Yes, it helps, but it certainly won't eliminate it. It's also really not comfortable if you have to look/tilt your head up with it. I tried to use it to drywall a couple of ceilings, and it was somewhat in the way and uncomfortable. Looking straight ahead or down with it is better. The mouth piece could be a little more comfortable in general, but I suppose it gets the job done. Personally, I think the price is about twice what it should be for what you get, and I wish the plastic was a little thicker. I already cracked the cross bar that goes behind your neck, when I tried to pull one of the sides loose to put it on. They definitely don't use any more materials than they need to on this thing.
Now, what do I like? It's light weight, it's convenient, you can pop it out to take a drink, or wear it with a face shield or hood, and for the most part, it stays out of the way. You can also wear safety glasses with it without worrying about fitting weird or fogging up.
Now, I must admit, I've not been using my breathe easy as much as I thought I would, but the face mask they sent is a little on the small side, and not very comfortable. Also, you've got a hose to keep mindful of, and the belt/battery back can be a little bulky at times. As for its effectiveness, it does do the job very nicely, and the fresh cool air blowing in your face is nice. If I had a slightly bigger mask and a longer hose for it, I'd probably use it a lot more often.
