This morning I took the train from Tobo, changed in uppsala and got off in Märsta changed to the bus.
took 1hour 40min station to T5 and cost was nice.
if I am to be honest I would prefer this method stays as it works and it's cheap. It's only a 10 minute ride from Märsta to the T5. It drops you off right where you need to be.
I save about 180Sek and ten minutes over the old system.
I guess when they fix this the train from uppsala will no longer go via Märsta.... pity because if the truth be told I think it's just as good and half the price of going via the station in arlanda.