My first mask was a type I nose pillows, I think. It had little buds that cover the nostrils with a minimalist type of straps headgear. I liked it but it seemed to leak a lot and whistle. I found myself fiddling with it all night instead of sleeping and gave up after ten nights. Next I went to a mask around the nose. It had a gel inside and a sort of stablizer thingie on the forehead. I managed to keep it on all night two nights in a row and thought my woes were over -- until I woke up with red welts where the mask touched my cheek. I thought I had adjusted it too tightly, so readjusted for the next night, woke up with worsening red welts and rash. I guess an allergic reaction of some sort. The skin on my cheeks was peeling off. I figured that was a sign the mask was not going to be good for me lol.
Now, since Monday, I have what I call an Elephant's Trunk lol. It has a soft piece under my nose with buds that go inside of my nostrils and heavy y-shaped tubing --the 'tunk' -- that hangs below about 10-12 inches. The 'trunk' can also be pulled up and affixed to forehead strap with velcro and goes back over the top of the head.
Monday and Tuesday nights I had to finally take it off to get to sleep. It does not seal well, so it is much noisier than either of the first two masks. And the inside of my nostrils get sore from it. The trunk is so unwieldy that any time it gets bumped it hurts my nostrils. However, last night was a bit better. It seemed to get seated a bit better so was not as noisy and I did finally fall asleep with it and kept in on all night.
I should explain that I have problems falling asleep and have been going through a particularly bad spell of it even before the CPAP became a part of my nightly routine. I have a type of lupus and fibro.
I am sorry my descriptions are non-specific for maker, etc.

Thank you all so much for the welcome and response. I began with the CPAP fully expecting it would work for me and that I'd have to adjust to it but would begin to feel some of the good effects I've heard about -- like feeling rested. To my dismay, since beginning the CPAP, I am feeling the worst I've felt in over six months. I have very little energy, can barely get up in the mornings -- even by midmorning, and spend most of the day recovering from the night.
I have to confess the last couple of nights, I go to bed now dreading the night and wrestling with the mask all night. I did not want a fullface mask (claustrophobia), so went with the most minimal mask they had to start with. Even though I was struggling to keep it in place at night, I have almost been sorry I didn't keep on trying with it.