From my experience long pings aren't so bad on positionals as they are on combos. This has been super painful for me on MNK when I play from my work computer. Frequently the GCD would completely expire before my client got confirmation back from the server that I did indeed land that previous attack and am now in a new form, adding at least .1-.2 seconds to every attack round because my ping simply couldn't keep up with the GCD..

As an aside, businesses really get screwed with ISPs and other utilities in the US. That terrible internet connection costs like $80/ month for a business, but $20 for a residence, as it's the lowest offering they even have for residential (not the lowest for business class though -- they go all the way down to 2Mb/s). For $20 less at home I get about a ~50ms ping and 300Mb/s. I really only installed XIV on my work PC to craft/gather and even that's painful.