I use the similar Zettle card machine, its really simple to use with your phone. If you have a £20 job, u pay about 35p which i think is ok, 1.7% ish the last time i looked at it.
It takes all cards visa/master/amex, apple & samsung phone pay. I dont think the sum up does samsung pay though, if this matters. You can't take over the phone payments on the Zettle but you can on the Sum up (this is when i got mine a few years ago, not sure if its still current).
These machines are very handy to corner those customers who are bad payers/forget to pay you online.
If you can catch them in, they can pay on card, no excuses, you can then forget about it.