Phantom is Topo's cushioned road shoe, and the 4 keeps what the line is known for: a foot-shaped toe box you can actually spread your toes in, on a 5 mm drop rather than the 8 or 10 most road brands use. Under that sits a 35 mm heel, so it is soft without being tall.
It suits you if wide-toe shoes fit your feet and you want one trainer covering easy days and the weekend long run.
It is not a low-drop conversion project. Coming from a 10 mm shoe your calves will notice, so build into it over weeks. And at 264 g it is not the shoe for a track session — Topo makes lighter ones for that.