my skin certainly feels firmer after using it a few times.

It's very gentle, no sharp points.

no irritation after use but it feels a bit pricky when used.

I just wash it under hot water.

The instructions say to replace it every 3 to 4 months if you use it daily, every 6 months if you use it 3-4 times a week

I cleanse my face, apply my product, roll, and then the instructions direct you to apply a light moisture after, which I don't do. I use it at night so I am not sensitive during the day and I dont have to apply makeup over the rolled skin, which seems like it might increase the possibility of irritation

Use whatever you like in terms of lotions. This tool can just be rinsed off with water or dilute sudsy water.

The needles are tiny, and don't really "penetrate" the skin. The feeling is almost less than leaning your cheek against a half-day's growth of beard: not painful, but slightly prickly.