I've used a Suica card for many years now. I agree it's both fast and reliable. One summer I was crisscrossing Tokyo by train over several days, using the Suica card, so I got to see a LOT of commuters. Lots of people were in a hurry and would run through the gates (the default state is open, it closes quickly if your card is out of funds or there's another problem). Running through the gates while quickly touching the card to the reader. I've done that a couple of times myself.

It's also useful in that you can pre-order a Shinkansen ticket, for example, and link that purchase to your Suica card, which you then use for the Shinkansen gate. If there are other fees (which there may be) they're just deducted from the money the card holds, as usual. Makes everything very simple.

For me a physical card is easier than using a phone. A phone is so much larger so I would need to get it from a pocket somewhere, while the Suica card I can keep in my jeans pocket or some other easy place.