As I understand the process, the roller press had the advantages of speed and clarity of strike. It did, however, have several disadvantages - which is why the technology never really caught on once mechanized mint machinery became available.
First, the same design had to be carved several times onto the big steel roller-die - and each carving was subtly different, meaning that even coins struck at exactly the same time could look significantly different to each other.
The second drawback to a roller press is that, if the roller die cracked, the whole thing had to be thrown away and replaced, so overall die lifetime was much less than for a single-die device like a screw press.
A third "drawback", if it can be considered that, is that the roller press tended to "elongate" the coins - after all, the device is not all that different to a scaled-up version of the machines that make souvenir "elongated pennies" - so the resultant coins are (a) slightly bent, and (b) not quite round.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis