Problem with comcast residential plan is that the data cap per month is 250gb.
If you go business class at home, u get unlimited data.. either get a 50mps line or a 100mbps line.
On my 50mps line a 1 gb file takes 3 mins to download. its like 7-8 mb per sec.
I downloaded around 9Tb of data last month. No issues with them at all.
They will provide you a high end modem which is really well built and constant internet speed. Dont use wireless for ur desktop.