
By train it takes about 2h15 one way from Sonthofen to München HBF (21€ return with a Bayern Ticket, allowing day long use of any public transportation method). Quite a journey actually, but I like to see the people in person to whom I trust my life sustaining scuba gear.
UPDATE: Got an email from Gerda yesterday with a very detailed maintenance bill (238€) for servicing my regulators (two recreational sets, each consisting of one 1st stage, two 2nd stages, inflator hose & SPG; plus a third 1st stage with SPG). I paid immediately via online banking and today DHL promptly delivered everything at my door.
UPDATE: I'm in Mexico and my S550 second stage is not functioning!
UPDATE: Had my S550 checked by Marco from Scuba Price Tulum, who quickly found out that one of the two small O-rings on the white inner piston was damaged. Replacing it apparently solved the problem.