The single has worked well for me so far.
It is painfully slow from an empty tyre start, but it's worth getting a straight-through valve connection for a more rapid inflation. It means you can clip it on the valve and go and make a cuppa.
When close to full pressure, I then swap it for the gauge unit for the last pound or two...
For regular air-down and reinflate, it's ok as long as you're not in too much of a hurry.