Currently doing this commute (typing from the train rn lol) and I will say the 715 train from Providence is rarely full, and every time i walk near the lot by the train station it's nearly empty. The train back around 5 gets packed, I've always been able to find a seat though. The internet is spotty but if you have a good 4g plan it works for probably 70% of the ride. The train has thus far been pretty reliable, although I've heard some horror stories I've never experienced a significant delay (15 mins max occasionally). All that being said, I am only doing this commute for a year, and cannot fathom doing this long term with how draining it is every day. It helps a lot for me that my destination is right near the station in boston as well.