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I've used an Ayr plastic bottle with snozz hosing nozzle for a few years now, mostly in spring to combat/flush out pollen and such.

When I was in my 40's I had a sinus infection at least once a year, my left side passageways were small, so I had it roto-rootered and have not had a sinus infection since.

When I'm feeling congested, I'll use it, only 3-4 times a year.
You control the saline flow by how hard you squeeze, and yes you can get your ears to pressurize.
I have a process that works well for me, part of it is blocking off one nasal passage and filling the other side, block both by squeezing and holding your nose, bend over to rinse out the upper sinus's and then release over the sink until I've run about a cup of warm saline through.
Messy?
Oh yes, effective, yes again.